Without weighing in on DRtg or IU/Blackmon, I will agree with ASF that sometimes losing a player is more coincidental to a team's improvement than a cause, or at least not a reflection of that player's value. For instance, in '13-14, UM lost McGary after starting out 6-4, including a somewhat perplexing loss to Charlotte. Then they went 22-4 and thrashed the B1G. You can come up with ideas for why McGary's absence helped, like maybe it thrust Nik and Caris into bigger roles, or maybe it forced Michigan to play smaller, which was actually better (they'd been starting Mitch and Morgan, I think), but I'm not sure the improvement reflects on McGary's value as a player. Indeed, you could argue the contrary, that UM wins the national championship that year if McGary stays healthy.