What about willing and able but determined to argue for the sake of argument?
What about willing and able but thinks that reducing such things down to mathematical exercises isn't deserving of being taken seriously?
What about able and unwilling but will just agree publicly anyway and then carry on with previous belief regardless? Superficially willing if you will.
What about unable at the moment but
might be able if was willing to put some more effort in? Where does that fit on your chart?
What about unable and unwilling but given different motivation would willingly try to find a way to make oneself able? Where does that fit on your chart?
Etc.