I've seen pictures of those weapons and there is no evidence that they are the Forerunner equivalent of the Assault Rifle, Sniper, and SMG. The last one didn't even look like it could be an SMG.
I've only played one round of Zombie Ghost and it's pretty terrible. The haunted map remakes are baffling. Why are there random boxes and barriers everywhere?
Halo reach does not use it's ranking system to set matches. It compares the players' K/D ratio and commendations and uses that to match them. On the subject of randoms going up against parties, you're right that happens way too much and needs to stop. I have heard that Halo Reach's matchmaking system is supposed to prevent this, but it does very poorly.
Is it possible to make bots that could do that? At best the Xbox-controlled allies that we play with during campaign have been useless, at worst they've actually been harmful to the player. If it's possible, though, I'm all for it.
Halo 2 does not need to be remade and probably won't be. They only made Halo CEA because Halo CE was the first halo game. Remaking Halo 2 would be a waste of time.
I recommend the Inheritance Cycle by Christopher Paolini. It's a four book series. The first book is called Eragon. It's better than the movie adaption.