I don't think so. Lesnar, being a 280lbs wrestler, will be a lot stronger than either Klitschko even if they have MMA training. JDS will beat Brock I think, so there will be no need to look for someone outwith MMA to do it. Overeem would beat him as well.
tough call, no doubt either Klit could hurt him with Strikes, but what do they do from there back side??
If the Klits had no kickboxing, or anything at all...I'd say Brock. BUT having seen Vitali kickbox, he's one tough SOB, and if he had a little grappling (if he doesn't already) I sincerely believe he beats the **** outta brock! As for Wladimir I can't say. Haven't seen him kickbox, and he's much more robotic than his brother. If he hits Brock with anything though it's going to be LIGHTS OUT, but as far as him defending against Brock's grappling...I don't think he could (even with training)...Just to stiff.
:rofl A little training is going to stop a 280lb class wrestler from taking you down is akin to saying with a little training Brock could stand with Wlad.