Marvel's The Defenders: 10 Ways It Sets Up Daredevil Season 3
6. An Identity Soon Exposed
Matt's aforementioned tenure in prison was onset by his double life having been exposed in the public arena, and it was a reality that his live action counterpart came dangerously close to bearing in The Defenders.
Like Karen says in the show's eighth episode, it doesn't take much to put two and two together; Matt left with Jessica and Luke after breaking out of the Harlem precinct; Daredevil was sighted in Midland Circle with them; neither the Devil or Matt emerged from the events that followed. People are going to ask questions, and it's likely that Fisk - who was already very close to discovering the truth in season two - will have asked them too.
The uncovering of Murdock's identity is what begets Kingpin's decision to escalate his revenge against him in Born Again, and its unveiling in the public eye has dominated the character's storylines for decades. It's unlikely that the temptation isn't there for the show's writers to expose Daredevil's secret identity in the public eye, and, given the foreshadowing that occurred during The Defenders, it's clear that discussions have taken place regarding the character's potential unmasking.
Either way, it's a given that Fisk will find out soon. He's a clever cookie, sadly, and that doesn't bode well for Matt and his friends at all.