Yeah. The last year Collingwood's really improved:
2009: 7 innings, 134 runs at 19.14 with 1 half century and a strike rate of 136.
2010: 7 innings, 59 runs at 8.33 with 0 half centuries (HS of 16) and a strike rate of 102.
Collingwood's been abysmal in the last 2 years of T20i cricket. The only year he's ever maintained a remotely impressive level of performance was in 2007, and he only averaged 24 that year, with a strike rate of 139. If he's one of our best T20 bats at International level, don't you think he should start proving it, and start making some runs of actual note. One innings, in South Africa on a flat pitch is not enough to prove that he's one of our best T20 batsmen. His performances this year have been pathetic, and performing decently in the IPL on flat pitches against generally poor bowling attacks is not enough to prove he's a flash International T20 batsman.
Maybe Trott isn't the right option, though I'd consider dropping Kieswetter down to 5 and having Trott open with Lumb; but I don't think Collingwood is either. He isn't a particularly proficient captain, isn't making runs and the captaincy does appear to affect his fielding. If he's good enough in this form of the game, at International level then he needs to step up and start proving it. I'm struggling to see how he could possibly be deemed one of our best T20 batsmen at the minute tbh.