Fully agree with a bunch of your points here. I don't think the culture perspective is the driving force behind paying him, but it's a nice bonus.I would like to get him for something in the 18-20m per year range. He would become one of the best 6th men in the game right off the bat, essentially in the Manu role. Im thinking something similar to the deal that EG got with NOH after the CP3 trade. You would have to scale up for inflation, but I think that puts you right in that spot.
I actually think there is a lot of incentive to bring Collin back from a culture perspective as he was the guy who really set the tone in the first place and the Cavs have had a reputation of being a very player friendly team. We aren't going to Boston it and trade guys the day after their grandma/sister died without warning. If Collin wants out, I am sure Koby would work out an S&T. I doubt it tho, everything seems to indicate Collin loves it in Cleveland and will want to come back.
Incidentally, when talking about culture, I'm so happy that Jarrett, as the first of our young core to secure a nice bag for himself, has still gotten so much better which indicates he is still working his fucking ass off. What a great example for his younger teammates to take notice of. And I have full confidence in Collin to do the same if Koby gives him a contract that some here think is too generous.