You're not going to get anyone of Greene's level for just Marmol straight up. Again, unless it looks like he can be stretched into a starter, as good as he is, he's still just a reliever. He can help push a deal to completion in abi way, but he's not going to be the main part of the deal. And the others I mentioned? Murton is stuck as a man out of place, yet he's a great trade piece, especially with the Padres, who have shown interest in him. Cedeno would have to go becase the need the SS depth with Greene going, and the Cubs could handle that easily wih Greene coming back in return. I'd trade Marshall or Gallagher as the final part...I could really go either way. Bottom line, you're not going to get a quality and valuable player like Greene for nothing. You're severely overvaluing Marmol. i suspect a lot of trade partners would severely overvalue marmol, however. but likely not kevin towers, since he's smart. anyway, i would prefer not to trade arguably our best reliever for greene. yes it makes the team a lot better offensively, but i think the cubs would be better-served by trading spare parts (murton, marshall) and prospects (gallagher, and especially colvin since he's gonna suck) than significant contributors to the current team. teams that aspire to win the world series do not trade their best pieces in the bullpen.