Wilt, Blight, What is this???

[Southbound]

I have searched through the pictures and posts and just seem to get more and more confused. I can't determine whether it is early blight, fusarium wilt , spotted wilt virus, etc. etc. etc. Could someone take a look at these pictures and give me a place to start? I have had a few aphids, but they seem to be backing off., so I haven't sprayed safer soap in a couple of weeks. I try to keep them watered, but not overwatered, I have a good many tomatoes coming on-but note the picture of one I found today with the black underside. Any and all suggestions much appreciated. THANKS!