If we're talking trades, then ignore anyone in short-season who isn't a highly paid teen - and we're not trading any of those who are working out.
You trade partially to avoid 40-man problems and restructure your available roster, so the guys to look at are the top tier because they're also where the roster crunch is going to happen.
Marte's on the 25-man right now. Either Taylor or Sardinas is his immediate replacement in case of injury. and in theory you could keep both. If you did that it leaves you O'Malley, Jackson, Smith and Moreira as options to offer other clubs if you don't want to trade Sardinas or Taylor. A club trading a big-league reliever would be doing it for some insurance of their own because fungible relievers don't come at the price of hot teenage MIF prospects, even if most of the heat from our prospects is lukewarm at BEST.
I would expect Sardinas or Taylor to go, because O'Malley makes for a perfectly valid emergency SS if something happens to a couple of ours. If somebody wants a prospect, Drew Jackson could move relatively quickly and has the speed and cannon to be worth it on defense even if he barely hits, but the Ms would have to be getting a much better arm than I expect them to be looking at right now.
Thanks for the rundown man!
~G