it's prolly just the timing of the shot. I'd be he's just letting go, while Flex held it a half-second longer, the shot was taken, published, and eveyone's all "OMG Dillet can't pose!" 
Then you obviously dont know shit about Paul Dilett. He is quite known for his terrible posing and his lazy work ethic. He is a disgrace to bodybuilding as far as Im concerned. If it wasnt for his super genetics and his drug abuse, nobody would give a flying fuck about him... Just another waste of talent.
Look at this bullshit:
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Not one single back shot in that whole "routine"...
