I think Mike's been in and out of Matt's life for a while. He's been with Stick almost this whole time, but Stick had to go away on a mission and left Mike behind in Hell's Kitchen around not that much after Matt started rooming with Foggy. Stick may have done this on purpose, like he'd done in the TV universe with sending Electra to Matt. Only, this time, Mike doesn't know that he's supposed to recruit Matt - Stick just thinks what he wants will happen naturally. Without Stick, they'll start to bond again and then Stick can work on reeling Matt in...