Haha, or at least talk/bicker/interact in some way! I'm not sure how well 17 and Yusuke would get along (partially because I haven't seen DBZ in ages and thus, uh, can't quite remember a lot of the characterization), but it is almost a given that they ought to run into each other, I think, whether that be over the gear or in-person. These characters from super testosterone-filled canons oughta stick together, after all :')