I'm of the belief that SK should get partial credit or partial blame for any draft pick prior to becoming GM. Ultimately all that matters though is what he does from the time he took the GM position.
The problem with giving him any credit or blame for any draft picks or free agent signings before he became GM is that we have no idea where it was his idea to make the pick, where he got overruled and what he would have done in a given situation. I've heard the rumor that he was pushing for AP over Levi, but we don't really know what was going on behind the scenes. One person who does know what was going on was the person who hired him to be the GM, so I am going to assume that he was on more than off in those players he was pushing for us to get.