On the first part of your post, as I said earlier, this is a very difficult line-up to put together and although most have Frattin, lower in the pecking order, as a RW, like you say, he has had some chemistry with Kadri, which is why I put him on that line and he is a pretty good and fast player and I don't think you can justify putting Clarkson on that line just because he makes a lot of money and again training camp and preseason should determine where these players line up.
On the second part of your post, Face-offs are really important and the younger centers like Kadri and Holland, hopefully will learn from the older centers, until they become good at it, I put a line-up together, with 2 experienced centers on the 3rd and 4th lines because puck possession, on the PK, is extremely important and should one center get removed by the Referee, the other has a good chance to retain puck and kill off a penalty.