No, it's not.
But it's also true that for an extended period Itoje underperformed what he's clearly capable of. Maybe there was a bit of change of role in there but I'm not really buying that - you can still be evidently influential in a non showy way, Kruis, Hill etc. At times he was picked on reputation just as much as Binny or Youngs were. Maybe that was down to whatever his health issue was, but for quite a while we only saw flashes of what he was really capable of.
He's got at least some of his mojo back while paired with Chessum who's definitely another in the athletic mould. Whether he and Martin would be a better combination remains to be seen. Whether Martin and Chessum could become better still is another question altogether.
But Itoje's a smallish lock and I do agree that, at times, he has helped to unbalance the pack. Whoever gave the cramming best players into the England football team analogy got it spot on. It's about getting the best blend.