I am really concerned that EJ is bending Smith to fit his game plan rather than building the side around him.

I imagine in the back of Marcus' mind is EJ telling him what he wants to see, which probably contradicts his instincts we've seen at club level. EJ certainly did not utilise Marcus in the way we do, and you only need to see the decisions about who is first receiver (Slade vs Scotland as an example). 

I wouldn't be surprised when EJ does go, England will have a feel to how Quins did after Gustard left in the sense of playing carefree and enjoyable rugby, but that's obviously dependant on who takes over.