Doesn't that actually play into the PS4's favor even more? Multiplayer focused games tend to have higher attachment rates on the XBO whereas singleplayer focused games (e.g. The Witcher III, Wolfenstein: The New Order, Doom) have higher attachment rates on the PS4. For instance, The Witcher III sold twice as much on the PS4 in the US and UK.
And I never said the bundle would have a big effect on sales. Reread my last paragraph as I already acknowledged that fact. The bundle, however, can effect the gap. A 100K gap isn't that big and December appears to be a complete tossup. An extra 50K sales from the bundle can make a difference between winning or losing December.
You were speaking if word of mouth and PS4 having a higher rate so since it has no MP then theres no reason to buy a PS4 for FFXV of youre friend has it on that console because you wont be able to play with them. As for attach rates they are about the same for SP games.