Savannah: he probably knew of her at least a little bit, from when she was the LBJ first lady (lol, Grayvannah & LBJ2 parallels :|) but you're right that they probably don't know each other besides that. We will have to see if they meet now ;)
Marina: Their times in Austin totally didn't overlap at all but now that he's in the Greenbelt and may be working at Noa's shop they could meet later lol. I haven't even figured out if Vic knows him or not, but based off of what i plotted for Bishop, Vic probably could recognize him :| Once Vic figures that out I will let you know when Marina knows!
Isaac: yes I do think they would know each other from then. They're very similar in their histories with their loss of wife and child (or not) but both kind of fell into hazy lives after that for a while so maybe they sort of were cool with each other because of that?
Bea: He probably would have tried to jump her :( :( :(
Mina: Yeah, they may not have necessarily met but Joel and Marc were the same level in the APD so I'm sure he knows of her and she could know of him from a mention here or there? As much as he is awkward about the APD he wouldn't hold that against her if they ever met.
I think he would be nice to Paige and JJ if they met! He needs new clothes lol so he should go shopping :|