Yes, I would expect Andy to gain some significant ground. The top 4 could close up quite a bit since last year Djokovic beat Nadal in both finals with Federer a semi finalist in each.
As I suggested above near the end of the Dubai thread, IW and Miami gave an opportunity for all of the top 4 to close up on each other, and hey, with IW we've had...
1) Djokovic, WR 1, who won IW last year was just a semi finalist this year.
2) Nadal, WR 2, who was IW runner up last year, was also just a semi finalist this year.
3) Federer, WR 3, who was a semi finalist last year, reached the final this year.
4) Andy, WR 4, who was crap last year, won the title, ahh no, sorry apparently he was crap again this year and Fed won the final beating the guy who beat the guy who beat the guy who beat the guy who beat Andy in R2