#15 and #14 The Usos
The Usos are probably one of the greatest tag teams in WWE right now. They have been multiple-time WWE Tag Team Champions and it goes without saying that they're over with the WWE Universe. It's also confirmed that The Usos re-signed with WWE for a hefty pay raise over 5 years. While it would be a dream match to see them take on The Young Bucks in AEW, it's probably never going to happen.
#13 R-Truth
R-Truth has been one of the mainstays in the PG era of WWE. It's interesting to note that R-Truth made his WWE debut back in 2000 as K-Kwik. He then left for TNA in 2002 and made a name for himself. This led him back to the WWE in 2008 and has been with them ever since.
Considering that he's enjoying his run as the WWE 24/7 Champion and at age 47, it's most likely that his career will be coming to an end sooner than later.