See who you WANT to see at this point. If that is the marriage T, then go for it. You can't make a decision based on possibly what maybe the old T might think. That's nuts.

As far as seeing the same T for marriage and individual therapy goes, it should be just fine. My husband and I see the same T for individual and for marriage counseling. It actually works out beautifully because he is well-versed in the dynamics of our relationship so he has insight into us as individuals that a T who only saw us individually would never get. Neither of us has ever felt like he sided with one or the other of us at all.