Everyone is stomping their feet saying the answer should be more than the number which has not yet been disclosed, so we don't know, but yet everyone also refuses to provide a definite number.
So tell me, for an airport that only has two runways which intersect, at LGA's volume, what is the correct number of controllers that should be working that field?
This also assumes the FAA hasn't already done this math and the gaming-chair experts know more than the FAA (which they don't).
In my direct 20 year experience working millions of line kilometres of air survey, zero or one controllers works out just fine.
Again, you haven't sufficiently qualified your questions - it's not about the number of runways.
EDIT: I see you updated your response and added in a nod to traffic volume - that's a good start.
Other factors in this non linear multi factor equation are ... ?