I don't know if Noah is a better 400m runner than 100m runner (9.86 is still very good), but one thing I know for sure, he's not winning the 100m in Budapest if he can't win the US title in better than 10.00 in near perfect windless conditions tonight.
He gets out of the blocks fine in terms of reaction, but his pick-up and acceleration between meters 5 and 35 just isn't elite enough to factor globally in the 100. Works beautifully in the 200 where he can build his velocity in a more measured fashion into the turn, but that's not how the 100 works.
I think he's in the midst of doing mental gymnastics to convince himself of this 100m stuff because he believes it will lead to the 200m WR, but I'm not so sure. It didn't help him pre Tokyo and while I think he will still easily win in Budapest in the 200, I think the WR will come not through 100m focus but by staying healthy and playing to his strength which is his strength.
Watching him force the 100m stuff is a little painful and he was lucky it was a down year in the 100 and was even able to make the team.