Hulk works because he has the health to work his way across the screen without a neutral assist and has gamma charge to fall back on. Any blocked rb is an armored command grab mixup. The fact that most characters have to hit him twice is a big deal. He’s usually gained a few bars after he’s gotten hit, then just looks for a spot to gamma charge xf something, kill meterless and usually be at 4 bars or so. The damage and meter gain from that team with point hulk is pretty dumb, too. Against most points, his kill meters and like 1~2 positive and even if he has to use meter, he’s still positive enough to do his stupidly ambiguous incoming mixups, xf, and dirt nap.
Zero and mags can’t afford to be at a disadvantage in neutral. If they can’t get started and get shut out you get almost no meter for them dying. So it’s just going to be matchup dependant. If they can win solo, they can win with rb. If they are against another zero/mags with hori assists, you’re probably losing, though.
His team just has a stupid amount of synergy that has been built up since pretty much day 1 vanilla. I would never call it a top tier team, but it’s probably one of the best at punishing mistakes or reset heavy teams. Like pretty much every 300% team, it takes a hit in it’s neutral ability, but you have to respect it at the start of the match and you always have to be aware of your spacing and assist calls.