Nah, Pollock would do fine at #4 or #5
this would be the likely team for the first few games
1 to 5 ----> Sachin, Jayasuriya, Uthappa, Prince & Pollock
6 to 8 ----> Pinal Shah [WK], Saurabh Tiwary & co
9 to 11 ----> Bhajji, Fernando and Nehra
For Mumbai to do well, the likes of Sachin, Jayasuriya, Pollock and Uthappa have to do well. Prince is available so he will get a look in, while there is no news of Malinga. The key players will take up the responsibility and probably bat up, if they fall early then the domestic players from #6 onwards can take over, followed by the others and set up a decent total. Ofc if the key playes play well, the total will be more than decent
It's just 20 overs so they will want to make sure that the key players get to play most of the overs
Same would be the case for Delhi,
1 to 5 ----> Sehwag, Gambhir, Karthik, Malik & Tiwary [thats more like an Indian line up]
6 to 8 ----> Vetorri & the domestic players
9 t0 11 ----> Sangwan [i guess, he is a talented bowler], McGrath & Asif
Don't know when Malik and Asif would be joining the team, so Dilshan & Geeves can come in. Vettori will go to England after playing a few games