Rollins may not be a prototypical leadoff guy but he's the best the Phillies have. Abreu just does not fit in there. A 900+ OPS guy hitting leadoff? You are living in fantasy land. He is a run producer, not a table setter.
While Abreu might be a better leadoff hitter than Rollins, David Wright would probably be a better leadoff hitter than Reyes and you'll never see that happen, and for good reason. Those guys are more valuable when runners are on base.
Don't forget that Rollins is on a cold streak right now, but once he heats up (a guy with a 36 game hitting streak screams streaky hitter to me), he will be a dynamite table setter for the big bats of Utley, Abreu, Burrell and Howard.
Baseball isn't just as simple as putting the guy with the best OBP leadoff, 2nd best OBP 2nd and so on. There are other considerations like run production and power that you are overlooking.[/quote]