I love Thibs, but his stock was never higher than it was after he came to Boston. I don't think he got magically better after being an assistant coach for over a decade. He meshed well with Doc, and vice versa. I think Chicago got a fine coach, but I think Boston will be fine as well.
As for my second-favorite team, it's hard for me to really root for anyone other than the Celtics. I used to root for San Antonio, but now I like Oklahoma City. I just can't root for anyone in the East.