Why are the last 13 matches the only indication of his managerial capabilities? He won 2 of the last 13, but also won 8 of the previous 13 before that and 7 of the first 13 matches of the season. It is not as though, he is actualy on the pitch, anyway, he only has so much control. Generally, McClaren has a history of being a competent manager. The last time NUFC hired a manager with that description was Keegan more than seven years ago.
Baba, the last 13 matches determined an 8th place finish in a pretty hopeless league with one of the best squads in it. I'd take him over Carver in an eyeblink but let's not pretend he should even be on the shortlist.