My worry wouldn't be experience because he'll probably train.
My worry would be what effect such high stress exercise will have on the body of a man who likely took steroids for many many years. Also he still currently weighs 245 lbs?? he thinks this is good enough shape for a mountain climbing expedition? Most people who are truly prepared to climb some of these serious mountains are ready to run marathons. I'd be surprised if this guy could run a 5K.
Yea, that body mass will demand a lot of oxygen, and prove to be quite a load to lift up that high. I am on the heavy side as most climbers go, 5'11" @ 185'. When I was doing high altitude climbs, I weighed about 170'.
I'm sure a guide (or two, or three or four) can drag almost anyone up almost any mountain.
But hopefully, Layfield will try Elbrus and realize he might have bitten off more than he can chew. But if he makes it, then all the more power to him to keep going with the other six.
But you, know, most climbers I've met are pretty scrawny dudes.