It was obvious Pop and Simmons "didn't get along". Simmons is damn near the an hesis of a prototypical Spur. I remember the media asking him last season, after he had been benched and returned to the rotation, if he learned anything and he responded "nope". He was also dismissive when asked about Pop at All-Star weekend. It was played off as if it were a joke, but you could tell it wasn't.
Dedmon and Simmons (since he clearly never wanted to be a Spur, I'm glad he's gone) obviously weren't determining this team's fate, but the way their situations played out reaffirms this organization's narrow mindedness and is only going to make it more difficult to appeal to prominent players, most of whom don't fit their culture.
He's probably got the inside track to being the third wing. Isaac will likely be brought along slowly and is a combo forward, while Hezonja played PF late last season and they're clearly at the point where they're not giving him anything.