When we talk about loyalty in sports, about dudes getting it back from the team they gave it all for, we're talking about a very short list. Dirk, Reggie Miller, Kobe, Pierce... and obviously several others from earlier... those guys can rightfully say, "Alright, I gave my all. Now I deserve one last rodeo, a fat contract, or a trade to a contender," ... as the case may be. It's also why I kinda get D-Wade for telling Miami, "Hey, you balked at paying me - Eff you, I'm out."
Isaiah is NOT a part of that list. I'm sorry. In the NBA, you need to A. Bring home a ring or B. Spend your entire career or [dang] near it for the team to consider putting you ahead of it's future.
Ainge, for what it's worth, long complained that Red should've traded Larry/McHale/Parish when they still had value. He backed up that statement when he traded Pierce and KG.
There was NEVER a CHANCE Danny was going to give IT a max offer - or even a contract offer that lasted more than a couple years. IT was great for one year, very good for another, and did a superb job for what he's dealt with. But we can't all be the greatest.