Yes, he's got an unbearable grin which says "I'm making a lot of money and your expense!" but OTOH, he is one of the smartest promoters in the game. He is also more willing than most other promoters to match-up his fighters tough and make prospect vs prospect match-ups too.
Senior and Ronnie Davis would have absolutely skull-****ed Yildirim's entire entourage if they stepped out of line. Not to mention Sebastien Eubank can fight too. I'm sure the Eubanks prepared for that in case **** went down.
Oner didn't come across as a psycho to me, just a typical bully. The sort of guy who loves everyone pulling him back when he is going mental at someone he thinks he can intimidate (e.g. at the presser). If he had a free run at Sr with no one to stop either of them you would soon see him shrink away, and his two little balls would shrink with him.