I think part of it was the stress of the grindset that Linus running the show was getting all the staff into. Pushing out content at a regular schedule, getting sponsorships and all of that.
The whole GN saga with data accuracy and the donated cooler that made LMG look inward for a bit and improve their process was for the best I think.
The investigation to me is just one element making sure LMG weren't getting off on the wrong foot.
I think the complainant wasn't wrong or defamatory at all to bring up concerns because even in LTT's channel there was a video where the front and center stars of the team comment on how stressful things can be. When there's an implicit hierarchy imbalance (Linus can say "we're all equals here" all he wants) but fact is there's a leadership structure in one way or another, which can cause one to take certain treatment in different ways.