He's got more technical ability than Jenkinson, no doubt - who I don't rate as much as most Arsenal fans do. His link up is some of the most impressive I've seen in a long time for a full-back in Arsenal colours. Going forward is where he shines though, got such a great eye for a run, and loves getting in between the left back and centre-back - which not many full-back's do - in that sense, I'd liken him to Jordi Alba. Difference is, Jordi Alba defensively likes to stand off players, Bellerin's different as he likes to tackle, too and is ever improving defensively. Really becoming another one of those players with Spanish technique and developing some real English grit. Taller than Jordi, and becoming very robust now. Great player in the making - if all goes well, could be a very important player for Arsenal and Spain.
I'd definitely say he's the closest to the first team. If Sagna leaves this summer, and no replacement is made, I expect him to get his chances next season. Will be a starter by 20, no doubt.