Whilst I get that having a solid full back who can catch a high ball & make his tackles is a good thing, I don't see how just dropping such a player into a dis functional back line is going to cure all of Wasps issues.
Its fundamentally a coaching problem & without changing the entire back line Wasps ARE going to be "doing the same things with the <essentially> same players and expecting a different outcome" Its the coaching that has to change. I'm not suggesting the coaches are "Clowns" as some one else suggested but they need to change the plan to one that suits the players, remember they had such a plan not that long ago, or they will need to look for new jobs, IMO.
Personally, and as a psychology coach myself, I think we have to get over our conditioned thinking to believe that all insights and change of behaviour has to come purely from within the hierarchy of coaches.
I'm of the belief that both Mike Brown and Christian Wade could provide invaluable insight and vastly broaden awareness of what's possible in the game.
They may come at things from different angles (pace/flair and solid/safety) but the amount of valuable knowledge they could impart (through their journeys and experiences) is utterly unique.
Neither would they be backward about sharing information and insights.
Personally, if the opportunities arose...I would harness their experience.
Not all coaches are going to have all the answers.
In fact the best coaches (Ted Lasso
) simply create the platform and facilitate the problem solving process to the players (eg Clive Woodward).
Mike Brown around Ali Crossdale for a year would be better than purely having Everard and Blackett, who are not specialists. Everard was a backrow player, Blackett a wing/centre.
And someone like Mike Brown would keep our rather young back division in good defensive shape...as well as communicating well with his wingers outside him.
But, ultimately I would expect Crossdale to elevate his game...and play the majority of the matches.