Exactly what the problem was with each was different, but they were all either mechanical issues (Dempster tipping pitches) or a pitcher changing his approach (Silva, Marquis). Really, though, the important bond between the three is that they were all underperforming when they arrived in Chicago and Larry fixed all three (among others). I don't know if he could do the same with Happ, but if there's any improvement to be had for Happ, I'd be really confident Rothschild could get it out. The major league ready arms we have in the minors is definitely a reason not to do the deal, though.