I'm not sure bringing in a "faceoff specialist" is necessary, even if we assume we can get one. That can be fixed by coaching, and really doesn't have THAT much of an in-game impact. I'm hardly an analytics guy, but we were the best faceoff team in the league by a wide margin in 16-17, that should tell you something about how important they are.
As long as you can get something close to 50% you'll be fine, and considering that Jost, Kerfoot, Toninato and Compher were rookies last year, they have lots of room to grow on that front. I'm sure the coaching staff is going to work on that with them to resolve the problem, but bringing in a body to take a roster spot JUST to fix something that's not very important seems like overkill.
Faceoffs can have huge impacts on key moments in games. If those key moments happen in key games they can have a big impact on your season, or your playoff run.
There is no key moment stat, so this is why there isn't always a correlation between faceoffs and winning/losing teams. They matter in a handful of games, and don't in like 7o+. The games down the stretch in a playoff race, and especially once you're in the playoffs tend magnify the importance of key moments, but you don't see that represented in stats.
It's not a huge deal if they don't bring someone in to help with faceoffs, but if they're cheap, why not? I think Kamenev could start the season as #4C, but I don't think he'll be there for long. They don't want him playing there long, and I think he'll warrant moving up with his play.
If they bring in someone like Shore, or someone else, they can be a scratch until there's an injury or Kamenev moves up. Bringing someone in will really push Kamenev, Toninato, and Beaudin in camp I think, and that's a good thing. All of them could benefit from that push with callups later in the season.