I can only judge on what I've seen - I've never seen anything to suggest that Misha is really arrogant, or a bully. If anything happened backstage, then that's where Louis and Tulisa should have confronted Misha: backstage. Humilating her and tag-teaming her on live TV and putting her in such an awkward position that she has no real chance to defend herself and give her side of the story was the wrong way to go about it.
It just came across as if they see Misha as a threat and were desperate to find a way to bring her down. I just can't at Misha getting called out for being arrogant more than Frankie.
I thought Marcus sang the best tonight, but he was on first and sometimes opening the show can be a curse. I hope not though. I think Sami, Rhythmix and Frankie are also at risk.