I don't think it's an issue of who is coordinating the project because: We need anybody who takes part in something like this to sign a EULA. The project was: devs asked us to design a troop and they add it in the game. If devs ask something like that, it will obvious that they take the idea from us and so, can be sued because of that.
If we do the project without devs, they don't have this problem, they just can take the ideas (or not... that's the issue ). If even that is not possible, it will mean that if tomorrow I post an idea about one troop and by coincidence the devs implement the same, I can sue them which will be strange, no?
As said, in the first attempt, the Demonhunter was proposed. Can we sue the devs because they release one troop similar to the Demonhunter that we talked about on their forum?
I just want to outline that since 6 months there is no real update and I just try to find other solutions that posting a message every week...