This. Plus he was examined by 3 doctors. They say he cant fight, he probably shouldnt. However I do think based on the pic he should have a 4th, 5th and 6th opinion.
In this situation some people are only satisfied if you throw every doctor at the problem until one of them says yes. Dana is throwing a fit because his headliner is going up in smoke and now it's another Mousasi vs can match.
I don't have any issue with Gust pulling from the fight. That's a legit cut and is in a place where it can open up again easily. He could end up losing the fight due to that cut and effectively lose his title shot. Not worth the risk at all.