It's really hard to say if Chris is overrated, or even on a downward skill in terms of health and fighting/athletic abilities even with a loss vs Kelvin here.
Lets look at the performances, vs Rockhold, Chris was winning the first two rounds but began to fade going into the 3rd then threw a terrible excuse for a spinning hook kick and got punished badly, survived but was too damaged and gassed and Rockhold continued to pummel him for a TKO win in the 4th. Chris looked elite in this fight, he gassed a bit but put on a high pace, was eating big kicks and made a fatal error...these things happen.
Chris vs Romero, Chris comes out in round 1 and gives Yoel a lot of looks, is active, scores a couple short lived takedowns and wins round 1. Round 2 Romero got the back body lock and was able to man handle Chris a bit, Romero won round 2. Round 3, Chris has been shooting in or attempting to shoot in on Yoel's back leg all night, Yoel finally timed a counter knee and killed the Chris.
Chris vs Mousasi, round 1 Mousasi comes out pressuring Weidman and setting a high pace, Moose gets taken down several times but springs back up continuing to pressure. Chris wins round 1, round 2 Chris is fading a little and Mousasi is continuing to turn on the pressure (Mousasi said the gameplan was to break weidman with a pace he couldn't match) Mousasi begins to catch Weidman and the tables seem to be changing...then the weird knee incident happens and it's a controversial TKO win for Mousasi.
What can we say about Romero, Mousasi and Rockhold? All easily top 5 Middleweights, realistically Chris could lose to all 3 of these guys in his prime, Chris could lose to all 3 of these guys and still be the 5th or 6th best Middleweight in the world. But....Chris is coming off 3 consecutive TKO/KO loses, after the Romero fight he really needed to take a step back and build himself back up again not contiuing to take top 5 fights. Kelvin is, in my opinion as bad a matchup for Chris as any of these 3 men are, Kelvin's arguably a top 5, easily top 10 MW with tons of potential, super young, a surging star in the making...this fight makes no sense, if Weidman loses he was supposed to lose and if Weidman wins this fight still should have never happened for the sake of Weidman's career. I don't know who to blame, who's trying to ruin Weidman's career? His management? the UFC? Ray Longo and his coaches/gym? Is it Chris himself that's truly this dense? The guy needs to be fighting Sam Alvey or Elias Theodorou, not young monsters like Gastelum...get a couple wins and then start climbing your way back into the title picture...the reality we may be seeing the murder of Weidman's career.