There will be plenty of story lines coming out of the Bruins-Maple Leafs conference quarterfinal series, which opens on Wednesday night at the Garden, and Tyler Seguin will be right in he middle of the biggest one. Seguin, of course, was part of the mega-deal in 2009 that sent Phil Kessel to Toronto. Coming back were the draft picks that wound up being Seguin, Dougie Hamilton and Jared Knight. “I already looked at my phone and had more text messages than usual. Definitely the town is going to be excited, but I think we will be as well,” said Seguin, who like Hamilton is a greater Toronto native. So far the Bruins have had it all over the Maple Leafs on that trade, and B’s fans have never shied away from letting Kessel now it. The “Thank you, Kessel” chant that originated just a month into Seguin’s rookie season is now rather infamous. However, now with the Maple Leafs actually a pretty good team, Toronto fans might have a chance to let Seguin hear it. But he said he won’t hear any of the inevitable chatter coming out of the Seguin-Kessel storylines. “I won’t be listening, so I don’t know. Just my mom will,” Seguin said with a smile following last night’s 4-2 loss to the Ottawa Senators in the regular-season finale. Seguin has more important things on his plate. One of the B’s most gifted goalscorers, he’s sharing a large part of the team’s biggest burden heading into the playoffs. He has just one goal in his last seven games, and that score came in the final seconds of a loss that was already out of hand.