I also think part of the argument is that, since the majority of shifts are on the fly (and not directly after a faceoff), faceoff wins/losses don't affect possession as much as initially believed. And then there's the fact that the difference between a "good" faceoff guy and a "bad" faceoff guy is only about 8%, or around 20 faceoff wins a season.
I think it's more that faceoffs can situationally have an outsized effect on the final score.
For example, tied game in the 1st, you get the first powerplay. You win it cleanly and set it up in their zone probably increases the chance of scoring on that powerplay by as much as 20%. First goal of the game is massive. Conversely, if you have a kill, say in the 3rd, and you're nursing a one goal lead, getting possession in your zone and teeing it to the other end is a huge momentum builder to start that important PK. The opening faceoff to a period is usually a lot less important, unless that faceoff is for 3v3 overtime.
Also another huge game from Necas. He looks like a man possessed out there sometimes, and with great scoring to boot. Looks like we might get 72 point Necas this year, and I'd bet a lot of that increased production will come from the powerplay.