Frankly I think you’re over analyzing this braid thing brother.
For one thing when you clip the ends off the braid is naturally going to open up a bit. The grain bed is really where your filtering is going to occur after the vorlauf. That’s why people still get clean wort from more porous devices like a false bottom or bazooka tube. So if you think one braid is looser than another and you’re worried about stuck sparges then get that or get a bazooka tube.
I bought a water heater hose because it was longer and I wanted to do something like Greg’s design. In retrospect I think that was overkill. I later read a post from Denny saying that a 4" braid would likely work just fine since the liquid is going to get pulled from the suction point right by your valve anyway.
Having said all that, bottom line is it’s YOUR MT so build it YOUR way. This hobby is all about doing it your way and there’s a lot of trial and error.
And just for the record, I don’t think ‘luck’ has anything to do with Denny’s success in brewing.