Sanders, Brewster and Peter are/were three mighty big punchers. But I think Wlad would beat all three by stoppage if he faced the same versions now. It's going to take more than just a big punch to beat him. He'd stop Puritty inside 5.
Wlad, trained for a little more speed. Jennings, to me doesn't seem to have enough of anything that leads me to believe he can win. His physical traits, hand/foot speed are good but not great. Punching power is good, again not great. Jennings, will have to bring something I, haven't seen him bring in any of his fights. However, this is the first time he has really devoted 100% of his time to training, so who knows. Maybe he will pull a surprise. Much like Wilder against Stiverne. Not expecting much truthfully, maybe 5-6 rounds. Going to take speed and power to topple Wlad. You also need to be able to take it.
And only Sanders hurt Wlad seriously, not to mention there was devil headbut with the hooks. Peter knockdown him with rabbit punches. And the third was due to out of balance, Wlad get right after he goes down. With Brewster exhaustion from(drugs maybe) was the reason. And still Wlad take heavy punches and was floored after the bell, which should lead to point deducted and time for recovery for Wlad. But this was great set up, not accidentally Wlad change almost his whole team after that fight. Yeah he was trying to change his style, but not only that. Strangest gassing i ever seen ....
Strange gassing? (1) Well being hit from arguably the hardest puncher you faced tends to take a something out of a fighter historically not known to take a great punch. (2) At that time in his career, Wlad was tossing over 60+ punches per round. He tosses far less today. He simply gassed from a combination of throwing to many punches, and getting smacked from a heavy puncher. Not really some secret, that those two will do it every time. (3) Then lets factor in that Wlad fights tight, well there's three things that all contribute to a fighter gassing. Not some secret, instead we hear these weird conspiracy theories of gangsters and being doped, Don King...blah, blah blah. Whatever. I can only imagine, if by some miracle Jennings pulls an upset, what conspiracy theories will be flying from the over the top versions of Klitschko fans.