Well, Kota doesn't really have a team seeing as the number of students who graduated from the Academy were VERY unequal(Fuck you Oda, terrible Hokage.) So he could be learning things from different sensei's anywhere. In fact, he's really only interested in learning how to increase his prowess with his Releases, which are Fire, Wind, and later Lightning(And another, only because of his Kekkei Genkai). So if Ria has any of those three, he can expect to be trying to learn something from her, especially since she's an S-Rank Kunoichi. It's also the reason why he's asking Kokai if he's a Jonin and has Wind Release.