Handling a junior who doesn't play by the hierarchy

Phrasing this in pretty plain language (purposefully using they/them to protect ID)

Have a junior employee who is quite good and everyone sees their potential, but we have a unique situation with them. They continue to "punch above their weight", be it in meetings or while working. Sometimes it is funny when they are arguing for a position they don't know, but in many cases when you hear them out they have strong idea that with tweaking has been implemented and used in pitches and credit calls by very senior D's and MD's. They are very in-touch, and some of us believe that it is a harbinger of the Gen Z employees to come as they don't always loop in the rest of the team, are very comfortable going to executives, and plays by their rules by taking time when they need it (after 2 5/6am nights deciding to not come in for a day - but they play it smartly, and if they have something to get done, they get it done).

How would those with experience in the industry manage this? Do we let it go? The flashes of someone a year into the job massively changing the direction of a project is exceptional, but the apparent understanding yet disregard of the hierarchy is not commonplace. Some days I want to punch them in the face, some days they're the MVP on the floor. Personally, I don't hate it as much as some of my colleagues do, they get pissed that they had to play by the game and our junior is not doing it, but I view it as someone who is capable of contributing at a higher-level, and is smart enough not to let themselves burn out. A while back when I'd be crushed pulling a few extremely late nights in a row, I'd go in but I wouldn't get much done - I was drinking coffee to stay awake until I could get some sleep. Our junior takes the liberty of the time, but does get in when things come up.

It's interesting as I think this sort of mind-set could be beneficial across the industry, in some ways I want to protect them to make sure they get a fair shake, in others I see the fact that the hierarchy in banking is legend because it is so strict and rigid.