Basically what he did was increase the voxel resolution size to be pretty high in order to have enough topology and vertices to grab a neck from it using a mask. I feel like this is pretty dumb, since it seems like he's just cramming in more unneeded topology to make up for the lack of a neck. I saw this one modeler add a cylinder, move it in place, and then shape it into a neck, but then how does he merge it with the model? I have so many questions, but the TLDR is this; from what you've seen in the pictures with the crappy deformed neck and the other one, what's the best way to make a neck while not needing 60,000 vertices to do it?
I realize that to an experienced modeler this question is really retarded so don't roast me that much in the replies. Also, I know some people just use the grab brush but as seen on the left head it doesn't go very well unless it has a LOT of vertices as seen on the right.