I won't say for certain who I voted for....but had a couple general comments. Hopefully these will help you guys create better custom stats in the future!
Syn, I actually liked your new ability 'Betrayed' quite a lot. Cool idea. I just didn't understand the Commander effects at all. The only pilots the Republic faction has access to are the Cloud Car or Shistavenen pilots, neither of which are all THAT great, even with the nice CE boosts. I also didn't understand how Lightsaber Throw was needed as a Force Power since he didn't have Melee Attack anyways.
Kast, your Grievous, at first glance, was my number 1 choice. But the wording of Onslaught....
The way it's currently worded it allows Grievous to take 8 attacks at each adjacent enemy with Onslaught. I'm pretty sure you intended it to be 4, as 8 is ridiculously unbalanaced. Against a Force User, even somebody like Vader with a 23 Defense, it will would still be almost a sure kill, especially with Deadly Attack in there as your odds of rolling at least 1 19 or 20 in 8 attacks are pretty substantial. Not sure I understand Ruhk's comments about dominating Grievous, as you could do that if he were in any faction, so the only benefit to being Separatist in that way is that you can use San to wait until the end of the round to rush out with Grievous. More dangerous though I think would be the current MTB style San squads, which allow you to unleash pieces like Tyranus LOTDS or Aurra JH at the beginning of a round. With this Grievous, you could run 14 squares at the end of a previous round, then MTB your way to winning initiative, and unleash hell. If you catch even two of your opponent's major pieces that way, it's game over, regardless of the drawback of the -4 Defense. Especially when nearby Force users are losing 4 attack anyway, so it balances out. So, like I said, I really liked the idea, but the way Onslaught is worded allows for 8 attacks, and just makes it WAY too imbalanced, IMO. Reworded to grant 2 attacks (which with Twin would make 4) and it would be pretty well balanced, IMO. I would also lose Stable Footing outright as well. Will Climber should cover things for you just fine.
TCW's Exile is a neat idea, but seemed WAY overcosted to me. Force Sight is a cool idea, but in the current meta of Never Tell Me The Odds, the ability just isn't very powerful. Make it a Force Power costing 2 or maybe 3 points, and maybe I could see it better then. Being Fringe and able to take on anyone else's Force powers that he wants is a pretty slick idea though. I could think of several instances where that would be fun.
Xanthan's Darth Traya......how would you fit all that on a card? LOL. And can you imagine the uproar if a set was released where there was a piece that was COMPLETELY unplayable without another piece? Sure, there are times that kind of happens anyways, as certain pieces have good synergy. But what happens in a sealed event when you get a Floating Lightsaber in both boosters, but no Darth Traya? And even at 79 points, she seems a little undercosted. If you're facing Jedi, the 3 Floaters (lol) would be a +17 attack for 30 damage...and with all 3 of them activating at once, it's basically like Traya having Triple Attack even after she's dead. And it gives her an effective 250 HP! Compare this to the new Darth Sion, who, while he has more HP, his damage output is substantially less. To top it off, Force Drain is exactly the same as Darth Nihilus' Sith Hunger, just different amount of damage. No point to create an all new ability, just make it like 'Sith Hunger 2'.
Darth Serge, I also liked, but the combination of Twin, Assault, Jedi Hunter, MOTF2, and Sith Fury means he would make 4 attacks, at +15, for 50 damage each. And that's AFTER moving 8 squares! Unless you're swinging at vader JH who has 23 Defense AND Block, that will kill just about anything in the game in one activation. So even for 73 points, seemed a little too powerful to me. Compare him to Lord Vader....one on one match, who would win? Hands down DV SA every time. I love the overall idea though. This embodies Anakin's rampage into the Jedi Temple in ROTS quite well.
OK, that's all I've got for now. Good luck to everybody!