I think at any point in an athlete's time competing, they will use some form of PED to give them an edge. So you saying that the top UFC fighters are using, I won't take it against you and you know what, I totally agree. But really I think it should be regulated rather than an outright banned. And tbh I don't really care. I just want to watch these guys throw leather at the peak of their abilities. Amd PED's are the way.
Here's a couple more vids to watch... Keep in mind that the next event is gonna be in high altitude in Mexico City. Fighters are gonna gas out.

I have used PEDs myself and have a very good knowledge in pharmacology. Merab's stamina is out of this world, the only thing that can give you this level of stamina is EPO (and still you need a super amount of work) and you have to be on it the moment you fight, it's not like cycle in the past and keep benefits later, it's only active when you use it and it's super dangerous drug, it's very dangerous. I just hope that he is one in a billion (billion, not million) and I also hope that he won't die from heart attack. I wonder, how high his hemoglobin really is
