So go tell Martin, Pintado, Widmann etc etc that they're doing it wrong. What's the point in such a claim? Those people hardly intervene on this kind of threads and there's a reason for it.
There's plenty of demonstrations that 5th port works just fine with loop bungees. The difference being that it'd rotate your tanks a bit. You loop them on the valve, we loop on the extension...
"We" also try not to expose our regs to the environment, just keeping
@joshk , but didn't you know Mauro does it all wrong?! I mean come on, look at him, it's obviously wrong! Do you think he scooters? Nah he obviously never uses a scooter! Only Edd can use one, because it's Edd.
Pro-tip: there's different ways of diving sidemount properly, unfortunately, when one tries to apply stuff from one rig to a rig that is completely different, it tends to not work very well. But since he's been doing it for ages, that's the way it has to be done and can't be done in another way or he'd have known about it (why? Because he's been doing it for ages, so it's correct).
As some people say, I wanted to note that
@DevonDiver is "f*cking cabbage" (savage) with his post.