If the court conditions were the same as in Dubai last year (ie. faster) Federer would still be world number one. Murray said so himself after Federer comfortably beat him in straight sets there last year. If you have a surface where the two best players in the world on that surface play, and there are 40 more UE than winners in a 4 set match, then it will be very difficult for anyone over the age of 30 to ever win that tournament, if not impossible.
If Murray and Djokovic can sit two yards behind the baseline trading backhands for twenty shots per rally and rarely miss then no-one will beat them. Rafa will have no chance with his knees. Del Potro and Berdych obviously need faster court conditions. Ferrer has no chance as we saw in the semi-final. Who else is going to conceivably beat them other than Federer? He's still clearly the number three player out there, and had he had Djokovic's draw, there's no doubt he would have been in the final. Perhaps if Djokovic had played a tough five setter with Murray and then faced Federer the outcome of the tournament could have been different.
Number 2 according to rankings