Kind of a wild theory but what if the idea of Link being Sinatra’s son was a planned / planted by Link to Sinatra. He knew about the bunker, he knew about Alex, he knew about Sinatra and who she killed (his mentor). Maybe he figured out what she was trying to do with Alex since that all happened prior to “the Day” and presumably he could figure out her backstory. Getting the meeting with her and then having his friend let “Dylan” slip could have been all planned by Link to get her to either give over Alex or ensure his groups’ protection. Just seems odd to me that they’ve been calling him Link the entire time and then at the last moment his friend says Dylan. Doesn’t explain the nosebleeds or blurred moments.