I don't know how much help I'll be, but this is what I think! We tried pad training Sophia, that was not working for us, so she's def. an outdoor pottier. So, I applaud Geno for doing so good with it in the beginning! I actually think its harder to pad train! And no point in beating yourself over him not being trained! I've been slacking a bit with Brody and he's still having accidents too

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We had the issue where Sophia would run away right when she was on the pad too (she is also a darter). So i'm wondering if you can get one of those playpens with the door like this one
Iris Plastic Pet Pen 36x36
and just line the bottom of it with potty pads. You can leave the door open when he's running around (and maybe he'll learn to go in and pee). and if you catch him about to have an accident, plop him in it and shut the door so he can't run out. Then you can give him the privacy, and it will be completely lined with pads. Then as it gets better, you can slowly reduce the pads until you have one. Then eventually remove the whole thing!
Now i have NO idea if that would work, and maybe its a crazy idea, but it's just my 3:30AM brain thinking, lol.