The Youtube vid is Keith Horne, perhaps a lesser known but an absolutely monster of a player. He lived here in Nashvilile for many years and I was fortunate to watch him, on several occasions, play with the Wooten's every Wednesday night and 3rd & Lindsley. The two pics well... Bass playing positioning is like wearing underwear...as long as you like where it hangs and it's comfortable go for it.
Years ago, here in Nashville, I had to follow Keith Horne at an open jam (and this was after he'd just demolished 'Orange Blossom Special' on his upside down 6-string at 90mph . . . ) and felt like Twiggy subbing for Dolly Parton. I wanted to crawl under the kick drum . . . . .