The TK amp would stack to her abilities as a TK amped Purity would easily beat a non TK Purity as she can amp herself up. But it's not the physical boosting here that is key, it's the double amping of Sonic powers being applied directly into Thors ear from inside his head. Nothing in any movie that Thor has been in has shown that he can no sell a sonic attack from inside his head, as durability has nothing to do with it. Also she doesn't have to fly up to Thor as she has a Sling Ring that instantly puts her there, and again she is Flash fast as she fought Supergirl after both crossover events that displayed their speed(as the crossover has a much bigger budget than regular episodes).
Legion would not be KO'd because his Auto Sheilds would have stopped QS, or his Time Stop would have stopped him, or him doing exactly what Apocalypse did and merged QS feet to the ground as again he has done so to a entire SWAT team. And this is
before we add his Mind Stone boost and the NZT boost which on first use
gave a slacker photographic memory and able to remember everything he has ever seen(NSFW breifly around 3:30) and another person
awakened hyper senses and became a genius in minutes and solved a unsolvable case. Here David has the final version of the pill and 2 weeks of evolving, which in the movie after 2 weeks of use he was doing extreme things. Plus the Mind Stone has the capability to enhance intelligence much like NZT does and with his Intelligence boosted David would have both working in tandem easily.
Tyranno is specifically targeted by Ultron and even Godzilla falling from 2 miles high would not survive that, and given Tyranno's body shape there is no way he can brace himself and would land headfirst. Even in a direct fight Ultrons Motherbox/Borg enhanced Thor level strength and
Vibranium claws with
Extremis heat blades would beat Big G as mecha Zilla and robot Kiryu have pierced his hide with less power than Ultron has here along with extreme Mobility that wouldnt let Big G hit him physically or with any breath attack.
Also the Motherboxs boomtubes transported entire Armies, and here it's boosted by Ultron/Stark Tech and the Borg probes with their transportation knowledge and upgrades, so Tyranno would be ported pretty easily.
Thor being merged into Ego would absolutely hurt or take him out as
his flesh and internal organs are smashed and deformed as they merge with the planet(Hulkbuster armor isn't an actual body so there is no pain for Bruce in that scene).
Stormbreaker
can't depower the Space Stone just by being near it, nor would it reverse it's effects after they happen. Especially as he would drop it the moment he is phased and Thor has no molecular control over his body.