Well, I went out for a half hour and figured that I would be accommodating and leave the two of them alone, penned in the kitchen with water and toys as it was a hot day. They are getting along famously and I am pleased to see that...
Unfortunately, I came home to my house smelling like a urinal, and again, Ubi had jumped the gate. Steel is terrified of the gate will not pass it even if I were to lay it down on it's flat side (In my old house, I had the same baby gate against the stairway and I was going down the stairs with an armful of laundry, tripped and accidentally threw basket, and content plus the baby gate at my poor, unsuspecting dog. I figured that the fear of the baby gate was handy because he stays a respectful distance away... I don't foster it, I just don't encourage him to be braver

)
I have Ubi at my side 100% of the time to catch him in the act. So far, I've only caught him once and screamed bloody murder, which made him stop. I threw him outside, he went and since then he hasn't done it in my presence.
So, I figured since I can't trust the little bugger to refrain from using my house as his own personal pee ground, I need to put him in the kennel. Unfortunately...
I put him in just a few minutes ago with a kong and peanut butter. He's relaxed now but I'm in the room. I am thinking of letting him out right now because he's calm. Next time, I'll leave while he's messing around with his kong and come back in after 15 minutes. I'll let him settle and let him out when he's calm. I want to keep doing this until I can come in and let him out and he's calm again...
On another note, he's really super smart (if but a little stubborn). I already have him successfully retrieving balls (much to my Golden's dismay), responding to his new name, and sitting. We are working on recall, down and stay and he's slowly getting them, but as always-- these things take time.
As for the kennel thing... anyone have any suggestions? Do you think this will work?