Yes, this is how I understood it as well. I think we lost Tony rather than him leaving us.
That Tony asked for $10 mil over three years, Ainge balked at the 3rd year and TA said I'm going with Memphis then.
For me, I would not have hesitated giving TA three seasons at $4 Mil is necessary and I wold have tired to close in a hurry.
Also, based on the value I see in Tony as a wing defender, and enforcer for you on the wing...if it was a matter of starting, I might have approached Ray and said it's time to transition...it would have been good for Ray's career anyway, minutes wise.
I think there was a way to keep Tony but we didn't.