Claire absolutely should have been eliminated for cheating. She knew the rules and broke one. Bye!
What bothered me about Margarita was her behavior in the workroom. She complained about Claire stealing her design, went to everyone but Claire to talk about it and let herself get derailed in the process. I'm more of a "if you have something to say about someone, say it to that someone" kind of person. Claire did not end up using that top and yet Margarita was still blaming her for M's own inability to stay on track.
Michael also could have gone to Claire with his accusations of cheating and didn't. What bothered me the most is that when Claire was trying to leave, he grabbed her wrist and Claire literally was trying to dislodge from his grip. That wasn't cool.
The whole mess could have and should have been handled better but the producers wanted drama and they got it. I just want to see good clothes.
Ayana should have won, IMHO.