Dundee were asked to vote because they could be persuaded to a Yes vote (proposal states they would be in SPL) which Regan etc now know they need all they can get.
This is all being driven by the SFA Professional Game Board which is headed by Rod Petrie which I find very surprising considering his stance in the past. Also contains Lawwel, Ogilvie, Topping, Regan and Ballantyne.