There were several points in Luke Cage where Claire teased to Luke that she has a lawyer friend who could help him, hinting that Luke might want to ally with Matt, but Luke doesn't take up this offer until he's taken back into custody for his escape charges.

But this makes me wonder: what if Luke had taken up Claire's offer when she first hinted that Matt would be a good ally for him? I think this would make an interesting turn for the Diamondback half of the season.

It would be an interesting way of seeing how the Daredevil cast would deal with this matter. I think it might work as a Matt/Karen reconciliation fic, where Matt goes after Diamondback's organization with Luke while Karen tries to figure out the truth about Luke's past, intending to use Luke for a piece on whether the justice system needs to be reformed in light of the new spate of gifted people who've appeared on the scene.