In order...
4/5 don't. Superman's zoning is incredibly unsafe, WW has no zoning, MMH's zoning is questionable since his counter-zoning is the real power.
I'd say 2/5 do, and I'd put MMH and Aqua as a tie.
Incredibly unsafe? This type of rhetoric is only applicable if the Superman player is doing nothing but high air lasers or repeated ground lasers.
4/5 are power characters, yes.
d.1xxTrident rush is punished by who? Batman with Bats, maybe zod if he has trait out.
So in reality, 1/5 punish it, 2/5 in very specific situations. I'll take those numbers.
Batman, Zod, MMH with trait, Superman's F2, not to mention WW can start her pressure after a trident rush (not a position you want to be in)
4/5 have a better trait? Are you high? Who has a better trait? Bats and wraith come to mind, that's about it. I don't really value MMH's stretchy limbs over a combo breaker.
Aqua is easily a top 3 trait. If you're trolling, you're doing a good job.
Before the repeated nerfs to his trait, you may have been right. However, this far in the game's life, many characters, namely the one's in the upper echelon, have found ways around it.
4/5 have a better wake-up how? Aqua has a double-hit scoop, a 4-hit quick move in front, and a water shield. Lacks a bit of invuln but if you're just jabbing at him without the right timing you'll get a free 30% combo for your troubles.
How your forgotten that scoop is severely punishable and trident rush can be avoided by simply crossing Aquaman up? water shield is the only option that can beat crossing over, though, as you mentioned, is normally stuffed due to his lack of invincibility.
Even without invuln, unless you have a fast launcher you won't get the punish and if you recklessly jab at him you'll get the stuff. MMH and WW are ahead of him since they actually have something with invuln that's somewhat safe.
The problem for Aquaman is that most of the top 10/15 has this sort of fast launcher that you're referring to.
You're still looking at a top 3 character.