Well, I don't like him spraying and marking the porch and I don't know what diseases he may carry. I have not heard another fight, but I have not seen Finn on camera within 45 minutes of this cat being up there, so they're probably missing each other. Of course, he's not the only cat that I've seen around here, but he's the only one I've actually seen take on Finn.
Sorry, I didn't mean to sound rude or anything ha didn't realize he was marking too.
And that makes sense! Must be missing each other like you said. And yeah, weird he's not scared of Finn.
Maybe you could trap him and get him neutered and vaccinated and then release him again? Or at least maybe take him a shelter and they can do that release him elsewhere or adopt him out?