This deal won't affect the kids at all, IMO.
Right now, including Matteau and Tlusty, our forward group consists of 11 players.
Zajac
Elias
Cammalleri
Henrique
Ruutu
Palmieri
Gionta
Tootoo
Tlusty
Josefson
Matteau
I count six forwards on that list even remotely considered "top 6 forwards," and really, the jury's still out on everyone but Cammalleri and Henrique IMO. If someone like Blandisi or Coleman make the team (we'll assume Matteau will), they're not taking a spot from Tlusty in the top 6. They're taking a spot from Ruutu or Josefson or Tootoo where they can get their feet wet on a third line and prove they belong. If anyone needed to worry about this signing, it'd probably be Boucher, and maybe now that he won't be playing for awhile, Shero was able to say he had a definite top-6 spot open for Tlusty.