His style of play is a bit like Bellerin's, from what I've seen so far. Hector is also extremely fast, attacks a lot (see his goal against Liverpool) but he's able to track back quickly and tackle well. Although, in Hector's case, his situation is opposite of that of Yedlin's. Wenger converted him from a winger to right-back and it's turned out splendidly. I think Pochettino senses that he could do the same with Yedlin, with some loan experience first (Hector was loaned out to Watford and did quite well with them, I think).