I didn't really think about Robinson at sf, but considering how similar guys like Derrick Williams and Beasley transitioned maybe I should have. All three came out billed as athletic, undersized, good rebounding power forwards with a high all around skill level. Beasley is a sf at this point and Williams seems to be heading down that path as well.
Robinson has improved that jumper a lot over the last couple of years, obviously he has to keep that going, and he's quick enough to stay in front of guys on the perimeter, so this seems like a pretty natural fit rather then playing a small pf out of position. It should be interesting to watch his maturation, although it could be a few years before he puts it all together.