Just came up with a headcanon and wanted to share it.
So we all know Matt Murdock became blind because of unknown chemicals.
We can also see in the first Deadpool movie that they used chemicals to unlock Wade's mutant powers.
Which made me think that the chemicals that spilled into Matt's eyes were the same as the one from Deadpool and therefore unlocked Matt Murdock's mutant powers: heightened senses except for his vision as the same chemicals blinded him.
Just a headcanon.















