What the fuck is this? Did someone hack his account? Bobby Lashley has been fighting week in week out for TNA and fighting pro for Bellator at the same time, experts will tell you that's bullshit. Give him a good a drug test and Lashley probably wouldn't fight at all, though same can be said for Brock.
No matter what his wrestling is, Lashley obviously isn't training striking year round in the netherlands with top kickboxers, etc. Perhaps the heavyweight divisions are lazy in general, but if you want to be a top mixed martial artist, you don't get it by training wrestling and doing "wrestling shows" 2-3 times a month.
Lashley couldn't touch a UFC HW contender atm w/o luck and Brock left b/c he couldn't either. As far as competition goes, I'd have to think Cain and Overreem are much better then anything Lashley as seen, but Brock made Cain look way better then he is anyway. Conclusion, neither of these guys are Cain or Fedor, no matter how much size they have. If I had to pick, Lashley might win but that's only because Brock has proven to be an out and out bitch and not mentally strong enough to fight someone whose a challenge.