I thought Kernahan's response when asked whether Ratten would've still been sacked if Malthouse wasn't available was important. He had a long pause and then said something along the lines of 'it would've been line ball'
This to me infers that Malthouse loomed large in their thoughts when making the call.
If this is the case, then Walls (though I'm loathe to admit) might just be right, that Carlton is rolling the dice, again, hastily much like they did when they booted Brittain once they thought they could get a name coach in Pagan to come on board.