I agree there's not a true replacement for the 10T, ... But in the end I felt like the 10T (always written as a great speaker) would be a slight step back because of it's (and this is personal) long-in-the-tooth look. Bob Kelly is a sharp guy. He's not going to 'replace' the 10T with a total step back.
The Model 9 in no way has boomy bass. It's fast and tight. I don't agree that a large woofer like the 10T with rear porting would be easier to place in a room then the four bass speakers of the Model 9 that are bottom ported. How could that be? I don't agree Model 9s need a big room. 10T goes deeper in bass, but will need a good amp to control it.
I'm quite impressed with the air, soundstage and depth of stage I'm getting. They are driven by a pair of SimAudio W-6 monoblocks, btw.