I would prefer Vladimir (no body, no proof of death) but any of them will do beside Matt.
Foggy meets one of Matts enemies and neither know if their connection to Daredevil. The person decides to court Foggy and Matt is part happy is friend is happ, part terrified they are using him to get to daredevil. Cue protective Matt, amused Karen and Marci, oblivious Foggy and smitten whichever person you choose.