Phenomenal climbing talent. As DM says, he's been a rising star for a year or two now, has had several eyecatching results. And still not quite 22. I had that stage of the Route du Sud marked as one for him, so I was very pleased to see the result.
Only trouble is you won't see him in many of the big races because of the team he's on but he will be at the Vuelta this year, probably as team leader. (As a high-ranking Spanish Continental team, they always get an invite to the Vuelta, but they'll never be invited to the Tour.)
You'd expect him to get snapped up by a WorldTour team soon. Hopefully not Sky though - he'd just get swallowed up in the machinery there.