Dave Meltzer of Wrestling Observer Newsletter reports that WWE has penciled in Daniel Bryan VS Brock Lesnar for the WWE World Heavyweight Title at SummerSlam.
“We can confirm that the long-term plan for SummerSlam right now is Bryan vs. Lesnar for the title as one of the main events. So if/when Lesnar vs. Cesaro takes place as part of a Cesaro turn, it would be after that point. That can change if Bryan isn’t back for 6/29 and they move the title in another direction.”
Source: bleacherreport.com: You can check out Bleacher Report’s full article at this link.
Wrestling News Blog 
That’s why he’s kept the title. It all makes sense now.