It's relevant because the friendship between Kessel's brother, Phil, and Tyler Bozak (note the close-but-not-quite spelling) is one of the most weirdly endearing, random plot strands in hockey. They live together, and they're linemates — both, at least potentially, forever. "Bromance" is a terrible word, but …
To call it a running joke would be unkind, but it's at least something their teammates rib them about.
And no, Bozek isn't Kessel's linemate. She's a defenseman.