#1 R-Truth almost single-handedly carrying the division
It's true that Superstars like Drake Maverick have contributed towards the 24/7 title becoming a big hit, but one can't discount the fact that R-Truth has been carrying the division since day one. At this point, Truth has been involved in all the major title changes in the belt's history. He is currently a 9-time WWE 24/7 champion and has been the cornerstone of this storyline.
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There is a reason why Truth became the WWE Universe's favorite champion on the current roster. Truth has been wowing the fans with his comedy acts since a long while, and the 24/7 title is the exact thing that he needed to get more over with the fans.
Truth's misadventures with the title have resulted in WWE garnering millions of views, good ratings, and positive fan reception, and he seems to be the biggest reason why Vince McMahon is pleased with the 24/7 storyline.