I really don't think its motivation, becoz we all saw how he goes crazy to finish the fights from the start but got caught. I think its:
1- Terrible management from his managers,
2- No Mental preparations for a lose, or for approaching a fight after a lost that came after a decade.
I don't think its his manager as they don't effect his fight. Its has to be number 2, add that in with the pressure and the media it would kill you. The man did fight under the radar for years. MMA is so big now that he is getting heat from everywhere.