The problem with starting an alliance is you have to do it when you have some sort of power. People will always go to the power to protect their asses no matter how close their "alliance" was. Basically Donny needs to win an HOH and then we will see his true game
Is dual HOH done? If not, then the other HOH's team throws the comp to make sure Donny's nominations win so that Donny is dethroned and eligible for the backdoor.
If dual HOH is done, then yes, we get to see what kind of game he can put up.