if i'm the other owner, there's no way i accept this trade. and if this is a keeper league, then i want an elite player (maybe a kinsler type of player) in return or a similarly elite up and comer (maybe a mccutchen type of player).
i assume there are more than standard 5x5 categories since it's an h2h league. castro apparently has the green light because he's stealing at a much higher rate than the last two years. i think he'll bat at a .300+ rate with over 200 hits again. if your h2h league counts 3B, then castro is even that much more valuable because he is capable of getting triples, a very scarce stat. even his power increased over the last half of last year. but that might be more down the line. regardless, even with just the 10 hr he hit last year, this guy is a beast who continues to improve since his debut in 2010. and he plays SS. i think in certain leagues and in certain lineups, castro is nearly as valuable as hanley and tulo. and there isn't anyone i would consider over castro at SS other than hanley and tulo.
dee gordon is a one trick guy. i have a hard time destroy avg for HR. i'm not going to do it for SB. the gap is huge between gordon and castro. the gap between zimmerman and morrow, whatever that is, is not enough. and you're talking about improving the other owner in starting pitching (arguably the deepest pool in fantasy) to take a massive hit in SS (definitely the most shallow pool in fantasy). and if this a keeper, castro is probably kept for cheap as people caught on fast to this guy. you have to make up that difference too because his price might make him more attractive than any other ss.