You said RC several times. RC is the GM.
Anyway, so your basis is that you don't believe RC, because anyone can say anything in an interview. I can't argue with that. If you think RC is lying in the interview then I can't very well disprove that. You win.
Jimmer was not on a contract. Because no one wanted him. You can't just suppose a contract for him out of thin air and say "If he was under contract, and McCallum wasn't...McCallum would be in training camp instead of Jimmer!"
Jimmer has been in the league twice as long. He should be getting better. Cojo got better every year. Jimmer got worse. Not saying he can't turn it around, but if he does, it will definitely be a turnaround. He is a perfect candidate for the use of the word "reclamation". He has few NBA opportunities left, apparently. This has nothing to do with Danny Green.
The reason Ray will come in and contribute right away is that he is a point guard, not a combo guard. He will be able to play that position better than a combo guard like Jimmer hopes to be.
I may be too optimistic about Ray, but I think he has a skill set that is going to be able to thrive in San Antonio. If he improves every year like Cojo did (who went from horrible to pretty good in a lot of areas, especially shooting the ball), then Ray is going to be fantastic. I am optimistic about his aggressiveness. It's like the anti-Cojo. Everyone always remembers the Ibaka dunk, but never remembers the times where he dribbled a hole in the ground outside the three point line, or wore a sideways path into the hardwood from sideline to sideline.
He was definitely at his peak when he cashed out and went to Toronto, but I still like today's McCallum over two years ago Cojo, and expect I will like him better than today's Cojo after he gets out of Suckramento, and gets the same opportunity that Cojo had for four years. That can make a world of difference.
Jimmer might be great, in a different role, for similar reasons. But, I believe Mccallum would have had a job in free agency. We know Jimmer did not. And, I believe RC in his interview.