As of this moment I would start him. We are not scoring dozens of goals every match, we *need* goals. And out of the players who are fit to play two are scoring and one is not. I pick the two who are.
I would pick Iaquinta over anyone, next to him I would pick Del Piero if he is fit, if not, I would start with Amauri, and use Trezeguet in the second half. playing him in the last minutes is helping somehow! As someone else mentioned, Iaquinta and Trezeguet duo might not work together, somehow I agree with that and I wouldn't bench Iaquinta for that!
Having a sense of history helps. For instance to dispel such nonsense as "lucky goals". Some percentage of all goals are lucky. Some percentage of all passes are lucky. Some percentage of all saves are lucky. And so frickin what? Are they any less crucial? Without that luck we'd have lost. So why minimize the impact of someone's achievement by saying it's just luck?
I can say you made a very good post just now. But it was just lucky. Ergo you deserve no credit for it. Is that fair?
I say it again, the last two goals he scored and specially the first one, was total luck. Bouncing from the keeper or was it the post and he had a terrible shot/pass I can't tell what was that, then in! I won't make him a king for that. As for the previous goals, those are nothing to do with luck, it has to do with positioning, just like Inzaghi's (which I rate him much higher than Trezeguet, I always did!), these are their job, to be in the right place in the right time, Inzaghi's positioning is much better than Trezeguet's, but Trezeguet's finishing is much better from harder positions, and I love mostly his volleys.
I am a huge fan of Trezeguet, his old performances, I love it when he scores, I love his celebration and all.. you guys make me look like I am hater, I would love to see him back to his old form, but he is not there yet, not even close, if that will make me a hater, then be it!