Actually if that were the case, the game wouldve only sold around 4M. Thank the heavens for Xbox and PC for the added 6m sales.
VGC Figures (Physical only): PS4 4.2m (85.5%), XBO 0.71m (14.5%)
Capcom Shipped+Digital Figures: PS4+XBO (8.3m)
So keeping the proportions from VGC, including Digital and Shipped copies we'd get: PS4: 7.09m, XBO: 1.2m
So no, with just the PS4 version it's almost the best selling Capcom game of all time.
As it stands we're looking at 7.1m shipped for PS4 and 3.2m shipped for PC+XBO.
Thank the heavens for the PS4.