IMHO they offer the best combo for the Rams needs.
The father as GM with a proven eye for talent and the son as an innovative offensive mind to tutor Goff.

Only caveat is that the younger Shanny has no HC experience
Though my preferred scenario would be a veteran HC as leader plus a innovative OC and QB whisperer I do not see such a combination available for us with all the openings in the HC ranks around the league.
Just too many openings as HC for up and coming coordinators like Shanahan.

Go Rams!