Do you really think Shaun could work with EJ and v/v?
I actually wonder if Shaun could work well with anyone except Gatland.
They've worked together for 15 years.
When 2 people have worked together so closely for so long, it's hard for either of them to work in a different environment.
Shaun will have tailored his coaching approach to work the way they Gatland wants, that may not be compatible with what's required elsewhere, so it's not always a simple transition.
That being said, I can't think of anyone I'd rather have come to Wasps