Great article, resulting in far-away readers like myself getting attached to your chickens! LOL It's great to see cross-beak is still going strong. I would let him go on for as long as he can. I don't know if his condition will grow worse over time, but you'll notice that one he can't fend for himself, starts losing weight, and probably lose his social position in the coop, the cooking pot will be a relieving prospect. Until then, may he crow long and loud!
It seems like it does in fact get worse over time. It's even worse now than it was in the last photo taken here. Crazy, huh?
Yeah, I will let him go until he can't any more! :) He's an alright guy, even if a jerk. Haha.