I like these changes for the most part. There's a few things I'd like to address if these weapons will be updated and reintroduced in the future.Assault Rifle
If the Assault Rifle will be reintroduced in the future, I believe the weapon should implemented as a weapon pickup on maps. If it's going to be a starting weapon again, I believe the gun should be nerfed. For example, increased weapon spread and recoil making the gun harder to aim, thus creating a level of skill involved to being able to use the gun effectively in most situations.Energy Sword
Although I am one of those who really enjoyed using the energy sword on Truth, especially to run flags, I agree that it is overpowered in its nature to increased movement speed. If this weapon is going to be reintroduced in future seasons, there's a few changes to it that I think might work. Now you could take out the increased movement speed out altogether but this would drastically affect the weapon's use in competitive play, although still considered a power weapon. If it's possible, I think making it so that players can no longer sprint with the sword but keeping the increased movement speed at the same time would decrease the weapon's effectiveness.Splinter Grenade
If Splinter Grenades are going to be reintroduced in future seasons, there's a few changes I think a lot of players would like to see. Right now, the current Splinter Grenade is overpowered and effectively kills players with ease. I think reintroducing Splinter Grenades as Halo 4's iteration of Pulse Grenades could be beneficial as well as accomplishing its intended role of "area denial." Another possible change to the Splinter Grenades is making the damage from a Splinter Grenade weaker. Making it so it would only take away the shields of a player walking through it, much to the same respect as a player receiving damage from a Frag Grenade directly underneath them.Brute Plasma Rifle
In my honest opinion, I think the Brute Plasma Rifle is okay how it is. I also think it could be a beneficial replacement to the Storm Rifle in competitive play. You guys have already addressed the power of Storm Rifles in-game by decreasing the quantity of Storm Rifles on maps, increasing the weapon's spawn timer as well as making it so that there's only one if its kind on the map at a time. Whereas, similar changes to the Brute Plasma Rifle could be effective as well. I can see either making the same changes that were made to the Storm Rifle be changed in Brute Plasma Rifles, or replacing Storm Rifles on maps with Brute Plasma Rifles because of their ability (or lack of ability) to do effective damage to a player's health but also extremely effective to a player's shields.Weapon Respawn Timers
I think increasing the timers on all Tier 2 Power Weapons would be extremely beneficial to competitive play. As of right now, a 10 second timer to weapons such as the Scattershot and Shotgun make it so that these weapons are almost always in play at any given point in a game. I think increasing these weapons' respawn timers to at least 30 seconds would be effective because a player can no longer sit idly by waiting for this weapon to respawn while the other team is making a push for map control or kills.Motion Tracker (Radar)
I think both the Spartan Ability Tracker (Proving Grounds Radar) and No Radar accomplish the same goal, but by the same token I think the Spartan Ability Tracker is more beneficial to competitive play. Both of these versions of radars accomplish the same goal of increased awareness, predictability, and communication between teammates. But the Spartan Ability Tracker can also add another twist to the meta gameplay itself. For instance, if you know that there's an enemy player in your vicinity, you could effectively bait him into thinking you did something predictable or bait him into a 2v1 situation. For example, you could bait a player into thinking you just did a jump that requires the Stabilize ability and make him either backtrack or push you through a predictable area. Or you could have a teammate near you and have him sprint away on the enemy's radar, thus creating the illusion that you were the one running away and then effectively punishing the enemy player for chasing. Although I think the Spartan Ability Tracker is good how it is, I also think decreasing the current range of 25m to the previous 18m could be beneficial to competitive play. For my reasoning behind this decreasing the range of the Spartan Ability Tracker, I'm going to redirect to RyaNoob's opinion video on the Proving Grounds Radar. He states he hasn't played much of the current Spartan Ability Tracker so his stance isn't as strong as it could be. Although he advocates for No Radar over the Proving Grounds Radar, he gives some solid points on his dissatisfaction with the current Spartan Ability Tracker.https://youtu.be/KzLrxkEZIcM
Some other changes I'd like to see is increased ammo clips to the starting Magnum. I've played many games of No Assault Rifle/Proving Grounds Radar, and my biggest complaint is that I ran out of ammo in my Magnum quite frequently. I don't think an extended Magnum clip would be ideal because it allows a player to be able to get 3 consecutive Perfect Kills without reloading, which requires skill but also makes the gun overpowered since it will be the main utility weapon. Extra ammo clips would help tremendously. I would also like to see hit markers removed because it gives an extra advantage for players to know where an enemy is without using any other skill senses.
I've also seen many replies to this post complaining about spartan abilities, specifically Spartan Charge. I don't think Spartan Charge is overpowered at all. If you watch competitive Halo at its highest level, Spartan Charge is not a mechanic that can be abused and used in many situations and it's evident just by watching Pro gameplay how often a Spartan Charge is actually utilized (not often).
Overall, I like the changes so far. Hopefully we can see more updates to the HCS involving feedback from the Top Players in the scene.