KAM has not, based entirely on his draft record, and I'll prove it to you, using your own logic. Let's use your hit/non-hit criteria (widely debunked by Leviathan and myself, but let's go with it). In his 4 drafts, using the most generous interpretation of hit, KAM has had 11 hits (Ingram, Nailor, Addison, Blackmon, JJM, Turner, Reichard, Jurgens, LDR, Jackson, TID). In his last 4 drafts, Spielman had 17 (O'Neill, Conklin, Carlson, Bradbury, Mattison, Watts, Epps, Boyd, Udoh, Jefferson, Cleveland, Wonnum, Osborn, Brandel, Metellus, Darrisaw, and Bynum).
So. You can either admit that KAM has been a terrible drafter (and since the only way to build a consistent contender is by drafting at least competently, and in reality, well), or you can admit that the Vikings never should have fired Spielman, since he's clearly a superior drafter than KAM. Your choice.