Also, the difference would be that Ena would actually come in with the experience. His exact duties and responsibilities might be a question because he's currently getting his feet wet under a defensive coach. Who knows how much Gary is doing.
But either way it would still be more than Tuiaki had coming in.
Even if Sitake wants to trust his guy, it's still common for the guy they bring in to have a similar defensive philosophy. Especially for a young guy.