I'm a bit undecided on Grak and Crumbleberry. On the one hand, I don't like to disallow any 'official' rules if possible, on the other hand, they do seem a bit too good for their cost. Grak on his own is worth the cost without taking into account what Crumbleberry adds to a team. The other problem is the Kick Team Mate ability. It's extremely random but is a lot less likely to cause a turnover than throwing a player, and when the scatter roll goes in your favour its probably more likely to lead to a touchdown being scored.
I would be interested in playing some games with or against them to see how good they can be, but I think without playtesting I can't allow them into the league for now.