NIAGARA FALLS, Ont. — Martin Marincin tucked himself into a bit of shade surrounding the Gale Centre in Niagara Falls, Ont., the site of the Maple Leafs training camp this weekend, in an attempt to shield his eyes from the surprisingly hot September sun.



Marincin prefers not to talk about last season, nor the appendectomy he had before it began, nor his struggles in seasons before that. The 25-year-old, boasting 175 games of NHL experience, has a private Instagram account and hasn’t written a tweet in four years. He’s posted six tweets, in total, since he joined the social media giant in 2011.



Marincin is just as mysterious on the ice as he is off it — a riddle yet to be solved by the Leafs. And time to solve it may be running short in Toronto.



Three rookies are gunning for his job this fall and the Leafs head coach sounds nearly ready to move on from the former second-round pick if he isn’t able to build confidence this...