Rua's Manager, Julio Heller:
"We were in Sao Paulo and my phone rang about midnight. It was Lorenzo (Fertitta). Lorenzo was on another call, so I talked to him like half hour later. He offered me a rematch against Jon Jones because Lyoto had declined it and asked me to give him an answer in ten minutes. I hung up and Mauricio was there with me. We talked and called Dida in Curitiba and we got to a conclusion we should accept the rematch, but only if Shogun had a couple of months to train and it would mean a fight later in October or in November. I said that to Lorenzo but he said there was no time because Jon Jones's fight is on September 22nd. Unfortunately, he couldn't give us this time but he understood.
Mauricio accepted at the time the new fight against Jon Jones. The ideal is a three-month camp but he said yes to a two-month camp fight. He wants to fight Jon Jones and it sucks it won't happen now. But Mauricio's shot will come."
I think when you've already lost to the guy, it's understandable wanting to be well prepared for a rematch. Shogun was in a 4 round war less than a month ago and probably just started training for Gustaf, Jones is peaked and ready to go.
Shogun has pride and wants the rematch, but not accepting the 151 slot was the sensible thing to do.