I'm firmly situated in the "four ST5 players is fundamentally wrong" camp. It is just going to be overpowering in a long term league given even standard Improvements. If you can get doubles and stat increases on top then the team is going to dominate. I'm not yet convinced by the experimental roster. I don't hate the Tomb Guardians, but giving Skeletons Thick Skull and raising their cost to 40K sticks in my throat a bit. It just seems like a blatant patch. By all means give them a 40K lineman worth that amount, but don't just bend them out of shape for the sake of team balance. But I just don't think its possible to balance any team with four ST5 players backed by ST3 linos.
So, I've gone back to the 2nd edition Skeleton team roster (again). This time with one interesting change that gives the team a new angle.
0-16 Linemen _ 40k _ 5 3 2 7 _ Regen, Nerves of Steel _ G
0-1 Chopper _ 40k _ 5 3 2 7 _ Chainsaw, SW, Regen, NoS _ G
0-2 Throwers _ 70k _ 5 3 3 7 _ Pass, Sure Hands, Regen, NoS _GP
0-2 Catchers _ 70k _ 7 2 3 7 _ Catch, Dodge, Regen, NoS _ GA
0-2 Blitzers _ 80k _6 3 2 8 _ Block, Regen, NoS _ GS
0-1 Tomb King _ 150k _ 3 6 1 9 _ Foul Appearance, Mighty Blow, Regenerate
Notes:
1) The player's stats are a direct translation of the 2nd ed team, with the LRB 6.0 addition of Nerves of Steel. This seems like it might be a fun direction for the team, meaning they are unflappable under pressure. It is not that great on a lineman, but is essentially free on the positionals and so balances out over the whole team's TV.
2)Giving the ball handling positionals AG3 fits with that, and helps make the team less one dimensional.
3) The Tomb King is interchangable with a basic Mummy for me. I included the souped up version because the team is obviously lacking in other areas, and because it fits with the 2nd ed stats. If there is only going to be one of them, he might as well be the big dog.

4) The positionals are here named Lineman, Blitzer etc to differentiate them fro Skeletons etc on other rosters.
5) I'd also like to give the Tomb King a new skill - Toughness (S): The player is almost supernatually difficult to injure. Subtract 1 from any Injury Roll he makes. If this brings the total below 2, the player counts a merely Prone. I think this would be a cool way of showing just how montrous this guy is.
6) The team could subsitute another skill for Nerves of Steel. Perhaps a skill that describes the unstoppable nature of the Undead. Maybe Jump Up or a new skill that ignores all Stuns?
7) The Chainsaw goes on the roster for all those Khemri players who just like to kill things.

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Btw this is not a new idea:
Though the 2+ regen seems a bit much for me.In 2004 GalakStarscraper wrote:The PBeM tool is already programmed to play the Skeleton team from the Lustrian PBeM league
Skeleton Team
0-12 Skeleton Lineman 40,000 5 3 2 7 Restoration G
0-4 Skeleton Blitzer 80,000 6 3 2 7 Block, Restoration GS
0-2 Skeleton Thrower 70,000 5 3 3 7 Pass, Sure Hands, Restoration GP
0-4 Skeleton Catcher 60,000 7 2 3 7 Catch, Dodge, Restoration GA
Rerolls Cost: 70,000
Restoration is Regeneration that works on a 2+
Galak