Advice: Am I Overreacting as a Manager - Sr. Cyber Security Engineer Questionable Comments

I work over a small-ish (10-person) I.T. team at a start-up in SF, CA. We have a young Sr. Cyber Security Engineer who I inherited on the team. If I'm being blunt, (1) I find him highly arrogant compared to his actual abilities, (2) he and I do not see eye-to-eye on priorities, and (3) he has tried to blame me (to the CFO) for one of his mistakes not realizing he would check in with me, among other issues. …

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