So should we sign Sean Dyche then?
I think it's a good sign that Keane does so well in such an organized defensive system. Perhaps it masks some of his weaknesses (pace possibly?) but it also requires a lot of tactical intelligence. I doubt Dyche's system would work if he didn't have players that were smart/focused enough to execute it. That sort of intelligence is, more likely than not, transferable to Everton, especially given our much improved defensive structure.
I'd be worried about Keane transitioning if we played a more open style, like under Martinez. That required a lot of 1 v. 1 defending in space which is a big part of why Stones/Jagielka/Funes Mori all took turns looking foolish. Stones continues to struggle with this at City where, despite being more organized than Martinez's Everton side, they still leave a lot of space for counters.