Yep, that's exactly what I was thinking.

Now, I'm partly seeing current T to help with transference stuff with MC. If transference were to develop with T*, that would be different and could be useful in the therapy. If...say...seeing him caused me to develop a fear of men with beards (he has a beard), which caused issues in my marriage because H also has a beard...then that could be reason to leave. (I'm aware that example makes little sense!)

*I honestly don't think it has so far, maybe a little bit of attachment, but not so much transference--like I'm looking at him and thinking of him as my T. Not random male authority figure or romantic figure.