I said "glimmers." Hints, flashes, evidence. That's all you can really say about a SSS anyway. But his 2008 sample showed elite potential, and his 2009 sample, small as it was, reaffirmed the defensive side of things at least.
This guy is a good defensive SS, if his offense comes in a bit slower than expected he'd still be a starting caliber as long as he could stay on the field.
Unless his injuries make him tentative, I'd expect him to continue to be an above average defensive shortstop, and that can cover a lot of offensive sins. Which is all the better because I don't expect Lowrie to need to cover many offensive sins at all.
A player who's solidly above average in all facets of his game IMHO jumps up into "elite" on the strength of the entire package. If Lowrie combined defense near the level he showed in 2008, with a .350 OBP or more and 15 HR's, all of which are within Lowrie's demonstrated potential, "elite" might not be an understatement.
As for his injury's effects on his offense, worst case scenario IMHO is that Lowrie has to give up switch hitting and become a straight RHH, which I have little reason to doubt that he could adjust to. RHH has been his stronger side for awhile anyway.