A guy by the name of RDA happened and in such an unforgiving sport, I believe Anthony has really never , mentally, recovered from that. That and this is not an easy sport to stay on top ..... especially in a division (155) where while Pettis made his title run and achieved wheaties box status, top 155 talent was still being facilitated into UFC....and the continued evolution of others.
This is a brutal, thankless and unforgiving game. Dana was always right about one thing and that thing is that everyone has that small window to take advantage and capitalize in winning UFC title.