I have a teammate on my team who only flew in HS, nothing elite but she only knows how to fly. In honest terms, she is not ideal flyer size, she knows it and is so willing to learn how to base, that our coaches often think she's joking. She bases with me for 221 pyramids..Meanwhile we have a base who, low and behold is a flyer! We went several weeks before she got thrown up in the air, and she bases my friend too. She is probably the better flyer between the two.
In fact almost everyone on my team is capable of doing different positions, it's so vital to us because my team is one of the smaller ones within the program.