76 has his suspicions about Reaper using Talon for resources and intel, but he doesn't quite know how to breach that subject and he doesn't think he ever will. It still stands that he's collaborating with the terrorists that took Ana from him (among innumerable other things).

"It matters."

Even if Talon isn't here, Reaper still runs with them. 76 isn't willing to forgive that so easily.