I've seen nothing like that. I think peoples opinion of Baynes on ST is ridiculously high. He can become a solid backup center for the Spurs but thats about his ceiling in San Antonio. I've heard some laughable statements about Baynes potential.
If he returns on the cheap, then the Spurs are probably interested. If not then, they aren't going to torn up about losing him.
At this point, I just hope a decision in made sooner rather than later (October 1st) the Spurs are in a bit of a limbo with the 15 roster spot.