"Obviously?" Ah, the eye of the beholder.
At least two of Marty's dogs (Lil Bit and Rufus) are house dogs, and I think I've heard him say that he rotates them so they can have time in the house. And he does show his dogs, too, and does quite well with them. A recent brag included a BIS and Best Opposite for two of his dogs, on two seperate occasions.
Unfortunately, when you keep multiple Pit Bulls with any amount of drive, it is very risky (sometimes felony risky) to simply turn them loose in the yard together. Kennels frequently can't hold them, and the only way to safely secure them is with a chain. Which is why these anti-tether bills are little better than closet BSL, as was mentioned earlier. I spoke with an official who was supporting the anti-tether bill in one Texas town a year or two ago, and she told me that she liked it because it was
a great way to get at "people breeding fighting dogs," in other words, people who own Pit Bulls.