I wouldn't put much stock on Cael's silence on the issue so far. I'm sure he's thrilled for Taylor. Cael has never been a blabbermouth, which is one of the reasons I like him. I'm sure Taylor probably talked to Cael immediately after getting offered.
Yes, this is exciting. David has done well with youth clubs and has been a top assistant, it will be interesting seeing how he develops as a head coach. These things aren't guaranteed though, in my life I've been disappointed many times in supposed sure things.