i have gone over this all afternoon and evening, and I can't even decide which side gets the advantage. Depending on roster, I am actually leaning towards alou/chavez. I think alou is always underrated, and after rolen, arod I think chavez s of blalock quality. Rocket is a stud SP, but it runs out any given year, and the chavez side has a point there, if that is his consideration.
I don't always buy mora and can't treat him as an established stus. i think it is a fair trade.
As far as vetoing goes, I think that if you can't determine the better side after 5 minutes, it has got to go through, because at that point, the trade is probably driven by perceived need.