I do think that the ITS-ITB and ITA-ITC make sense because some speed differential is preferable in my mind...

An ITR-ITS-ITA would be horrible and and oversubscribed - ITB-ITC-SSB-SSC groups would fill few grids other than the NARRC runoffs.

ITR will be VERY small for a few years so I think it fits with ITS for now...
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Plus if you put ITA in ITS the ITS field would be embarrased! Oh wait I am in ITS.... Regardless amny times the ITA cars are faster than the ITS cars so you would have HP (ITS) cars fast in the straights and slower in the corners. ITS and ITA is a bad pairing.

I liked ITB and ITS. I agree with Dick. If we have 3 ITR cars fine just add them in. I am sad to see and hear that ITS continues to get smaller each year.