#2 Why Vince McMahon will not let him win the title: The Fiend vs Brock Lesnar

Let's think beyond Brock Lesnar vs Kofi Kingston. On Monday Night Raw, we have Seth Rollins feuding with "The Fiend" Bray Wyatt for the Universal Championship. Both Superstars will slug it out at Hell in a Cell, a match where Rollins is likely going to lose his Championship.
After Hell in a Cell, WWE will host Survivor Series where the traditional Champion vs Champion matches will also take place. Considering both The Fiend and Brock Lesnar will defeat their rivals for their title, we are likely going to see a match between them at Survivor Series.
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Wyatt is the hottest Superstar in WWE right now, and it means that Vince wouldn't allow someone to beat him this early. At the same time, Lesnar also can't afford to lose against The Fiend as this will severely hurt his credibility going forward.
If this is going to be the case then either Wyatt will lose against Rollins or Lesnar will lose against Kingston. Considering how things are working out in WWE today, The Fiend is likely to become the Universal Champion. And in that case, Lesnar may not become the WWE Champion.