In today’s links, Mike Matheson’s Montreal debut, a youth revolution on the Canadiens blueline, and the salary cap is projected to increase significantly. Montreal Canadiens news and notes It was a nervous, exciting Canadiens debut for hometown boy Mike Matheson. [Montreal Gazette] Matheson is ready for his new role as “big brother”. [La Presse] The Canadiens’ young defencemen must manage the mental challenge of the opportunity before them. [The Athletic] Jake Allen is ready to back up what could be a very young Canadiens defence corps. [CTV Montreal] It was a successful debut for Kirby Dach. [La Presse] Kaiden Guhle…