He is a redflag for how he treats the staff as objects in the beginning (literally throws someone off in the helicopter if I remember correctly). But I do agree he is nowhere as toxic as other BL main leads.
Chase is a green flag when it comes to his relationship with Josh ( if we ignore the chapters at the beginning), even greener than Josh, and how he treats his children. And certainly to the persons he trusts, if he find someone to trust.
What a lot of people get wrong, is that Chase doesn't act violent only because of his past and the meds, it has mainly to do with manifesting as a dominant alpha. Chase you see in the flashback as a child is still not manifested. Manifesting late makes them less psychopathic, but it still affects them. He is in this aspect more simelar to Keith, he can get mad really fast.
I avoided this since people in social media say Chase is a redflag but gave it a go because of the comments here and I must say he's nowhere a redflag. Annoyin? Yes. A brat? Yes. But not really a redflag. He a wary one because of his trauma and meds. I'm excited for the upcoming chapters since Chase is starting to get concerned of Josh.