Like devilish said, there might be a need for sacrificed lambt o look like there's a change, and INEOS to have their men inside. The one that Glazer would be less resistance on "high-level" position is removal of Fletcher as "Technical Director". Murtough and Fletcher as the sacrificed lambs.
They might give him a less "high-profile" role in name, if they think he's been doing a great job. ALthough like all of us here, it's just speculation. Like you said, we don't know if Glazers will allow INEOS to have much involvement.