Not being able to recruit via DF when someone leaves in a premade PF Alliance is a big no. Most of the time someone will end up not being able to commit or not patient enough and they will leave, forcing everyone to proceed with a few members left or have to restart from the beginning.

That happened to me several times yesterday and I'm sure they'll keep happening to other people. It's just a waste of time.

For now I will refrain from joining premade alliances unless they're all my friends and I know they'll commit.