Gerrard's best ever season came when he was played high up wide on the right. If we play him there it means we don't have to fork out for another right forward AND it means we could be have a midfield of sahin, lucas and allen.
If we get Tello to play wide right it means we have an extra midfield option allowing us to pick any 3 from sahin, gerrard, lucas & allen.
Why would you be opposed to either of the above options?
Depends on how you construe "best". Gerrard has scored 20+ goals in only 3 seasons (all competitions) during his career: 23 in 05-06 (kinda all over the place positionally while Benitez worked out where best to play him, but we won the CL), 21 in 07-08 (on the right), and 24 in 08-09 (in the hole, and despite playing a handful of games fewer than in either of the other seasons). Given that 08-09 was our best season in terms of the league (where 16 of his goals came) and in terms of total goals scored, I'd have to say he's more effective in the middle in general (and especially since the crucial goals he has scored have all come from front and centre).
Benitez's 4-2-3-1 is also not the same as Rodgers' 4-3-3, though each is able to move to the other in terms of "formation", certainly. But Rodgers wants something a little different on the right, I believe, which is why we have the choice of Downing or Suarez there depending on which way we wish to play. Gerrard only needs to drift to the right to overlap and utilize aerial ball if Carroll plays, whereas in the middle he will get possession more often and although he's lost some of his pace and ability is still right up there when it comes to winning (and scoring) free-kicks. AMC for me every time, especially if Carroll plays because then he can become the 4th forward (outside on the right) while largely retaining his presence in the middle. Maybe I didn't explain that well, though. Oh well, it's dinner time an I must be off.