It seems weird that a cornerstone piece of the team like Byfuglien would suddenly just up and retire without notice. I can't imagine what behind the scenes drama must have led to that.
...and it must have been sudden given that if the team saw this coming, they would have taken steps to start plugging the holes. One could argue the D was already gutted before this Byfuglien news, but now it's basically a large scale callup of the Moose defence plus whatever scraps Chevy can scare up on the eve of the regular season.
I hate to be a Debbie Downer and I'll eat my words in the spring with pleasure, but at this point it looks like the playoff window has just closed on the Jets.