Eh - fairways hit isn't a great stat. Missing the fairway by a yard is not equivalent to spraying it all over the planet and hitting 3 off the tee, but both count as a missed fairway. Strokes Gained OTT is a much better way to look at it (but not perfect, of course).
He's still been negative there this year, and he won't be "back" in my opinion until he isn't losing strokes off the tee. He'll never be at the top of the rankings there ever, but just needs to be mediocre and let his iron play and putting take over.
Just thought it was surprising that he was #1 yesterday in such a stacked field. Very rare (and not sustainable).