I think you’re missing the point that Hogsett is not just the mayor, but also the self declared public safety Director. (He chose not to appoint one after he was elected so that he could do it himself) The public safety Director is the ultimate leader over IMPD.Mayor = Leader
He stills owns it. I'm not totally cut-n-dry, and given a really good reason he shouldn't be accountable, I'd give him a pass. That ain't this.
So therefore as the ultimate leader of IMPD, he should’ve been available and in communication with the brass during those nights.