I applied to a graduate school in CS and got in. However, between application submission and acceptance a professor reached out to me and requested a phone conversation. It went well, as far as I could tell, and then a week after that I got an acceptance.
The problem is that I listed more theoretical people on my application and not him at all. While he does interesting work, it's decidedly applied work. There's nothing wrong with that, I'm still interested in the applied person, but I'm not sure if my acceptance offer (which comes with partial funding) is contingent on me working with this person.
How does this generally work? Am I stuck with this person because I didn't reach out to the other people? To what degree can I still 'pick' my advisor? Thanks!