McCoshen, who played with Matheson at BC for two seasons, signed an entry-level contract with the Panthers on July 1 after completing his junior season.
McCoshen (6-3, 217) led the Eagles with a plus-30 rating last season. The 21-year-old has the kind of toughness and defense-first mentality the Panthers lost when they traded Erik Gudbranson, the No. 3 pick in the 2010 NHL Draft, to the Vancouver Canucks for forward Jared McCann and two picks on May 25.
"We definitely think he's got a great chance of making our roster right out of training camp," general manager Tom Rowe said. "We like him that much. We think he's a big, big piece of what we're trying to do. His ability is the piece that we feel can replace what we lost in Erik Gudbranson, a real steady, stay-at-home, strong defensive defenseman."
Projected NHL arrival:This season
3. Jayce Hawryluk, C
How acquired: Selected with No. 32 pick of 2014 NHL Draft
Last season: Brandon (WHL): 58 GP, 47-59-106
Hawryluk, 20, signed an entry-level contract on March 1 before helping Brandon win the Western Hockey League title. His offensive production increased dramatically last season; he finished with 41 more points than in 2014-15.
Hawryluk (5-11, 186) is a hard-nosed player with offensive ability, but he likely won't earn a roster spot this season given Florida's depth at center with Aleksander Barkov, Vincent Trocheck, Nick Bjugstad and Derek MacKenzie.
Projected NHL arrival:Next season
4. Henrik Borgstrom, C
How acquired:Selected with No. 23 pick of 2016 NHL Draft
Last season: HIFK Jr. (Finland-Jr.): 40 GP, 29-26-55
The selection of Borgstrom (6-3, 185) came as a surprise to many, but the European prospect was regarded as one on the rise. Borgstrom, 19, has great playmaking and offensive skills, but he'll need to get stronger before he plays in the League. He will spend next season at the University of Denver.
Projected NHL arrival:2019-20