Are you transferring from a junior college? If so, the work is often more rigorous at a 4 yr school, and they may simply want to give you a chance to get acclimated before diving in. This may not be a bad idea. I don't see why he referred you to the other professor. That almost sounds like playing "go ask mommy/go ask daddy." What are you losing by delaying it another semester?
I don't know anything about the sciences. But I do know way too much about what happens when you cross someone and you later need them. This is not a position you want to be in. Trust me. So, please be super careful! While professors are supposed to be above all that, they are not. I had one who actually came right out and threatened to flunk me.
Have you considered actually visiting the campus and meeting with the professors? If you are wanting them to oversee your research, it would seem to me a face to face meeting is in order. They may get a stronger vibe from such a meeting that is missing in an e-mail!
Best of luck!