It seems pretty clear that JT and JB were not close. I think it is normal but it does seem like things may have gotten worse over this past year. My guess is that was a part of the reason for trading him. Not the main reason but another element of why they wanted to find a trade for JB.
Time will tell on if that was the right move or not. But do not think we are ever going to really hear about all the details of why it all happened and why JB had such little value.