Have him beat Lesnar. Have him survive the Braun cash in or u have Braun win it but he gets the belt back the very next ppv. He holds the belt till mania and they decide who they want to face him...the two top faces obviously being Seth and Braun.
I dig it... But if they do the Braun cash in and do a program with them two in the fall, they'll be done with it by Mania...
So to go off the ideas in this thread, a heel turn with Heyman turning on Brock at SummerSlam would work. Now Lashley has turned his back on the fans with Heyman as his agent. Then, Roman challenges him, they get a couple more matches outta that... Lashley then feuds with Rollins, gets past him... then he feuds with a returning Ambrose, gets thru him... Lashley's the top heel on the show, he has SYSTEMATICALLY defeated EVERY member of The Shield, ONE BY ONE (Heyman voice)... they could run that from September to the Rumble or February, easily... then the Rumble winner challenges on SD, leaving BRAUN to cash in for a one on one at WrestleMania. Heyman involved would ensure Lashley is a major heel, and Heyman involved in the feuds creatively would make Lashley more interesting as a character.