We have been shit pretty much all season. Therefore, either this has been happening for a long time with him doing nothing about it, in which case he is a poor manager, or this is a recent thing and the season long poor form is a result of him being a poor manager. My bet is that he is a poor manager.
On a completely separate point, I remember in the first heady days of young love a lot of people quoting Norwich fans saying that Culverrhouse and Karsa we're vital to Lambert's (ahem) success.