Morris has taken a big step forward as a prospect, but he is still far below what Hart's prospect status was. I'm not opposed to trading Hart, but our best current position prospects have ceilings that touch what Corey has done. Which makes it difficult to just plug in a replacement and project similar performance. I suspect part of the difficulty of putting Corey in perspective has been that his offensive peak has largely coincided with the league wide decline in offense. a 130 OPS+ is pretty good as a RF or 1st basemen. Not perennial All-Star, but pretty hard to replace. This year the OPS+ is down to 112 right now, but that looks largely driven by a lower than normal batting average. Barring a really good offer of talent with how Corey has gone back to playing 1st base I think most of the best combinations of teams going forward probably have him playing first, and sorting out CF and RF from the host of players with similar values, but different skill sets.