Not sure how much Ralph is still involved, if at all (at least officially per NCAA overlords). But I know a few former players that say he was the more player friendly of the pair, kind of like the team dad, where Karen was more regimental. One told a story of Karen jumping on her about something, and then Ralph playing "good cop" for lack of a better term after. This was a conversation I had 4-5 years ago when both were still coaching. Don't know if that aspect is missing in the locker room, that older wise voice who was more observant of team chemistry.
Also, it used to be rare that a contributor on the team didn't play 4 years. Sure, walkons would come and go, but top 12 or so players were pretty much 4 year players. Now rosters can have significant turnover year-to-year which does impact cohesion.