Ailes cost Trump nothing. Trump cost Ailes quite a bit. I did not see this debate but from what I have read, Cruz and Rubio both did poorly. I would say Trump got what he wanted out of the deal.
Trump cost Ailes nothing, in fact as time goes on Fox will probably get more popular for not conceding to Trumps bribes and hissy fits. It was a very good Debate without Trump. Best one yet and no one missed him.
I'd say they held their own. FoxNews was pumping up Rubio, and making sure Cruz didn't fall on his own accord. I think for external reasons (ground game, Cruz eligibility) votes will migrate from Cruz to Rubio. This debate is in harmony with that outcome, too.
-- I would say Trump got what he wanted out of the deal. --
Yep. The debate wasn't about him. Couple of "cheap shot" jokes, nothing stunning, made in passing. No serious suggestion that Trump has a problem on the issues, or of character or temperament.
Sum total, IMO - status quo.