The Friedkin Group reaches agreement to buy Everton

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They can assess the performance of Dyche without needing to interview him before they have control.
Thelwell as DoF is a more valuable source of information to them since he provides an overview of the entirety of the football operation which is his responsibility. Included in this overview will no doubt be his assessment of the first team and its current coaching team.
I don’t think it’s that surprising if they haven’t yet spoken to Dyche until they have decided what approach to take when they assume full control.
( Hopefully the first contact they have with him will be a farewell handshake ).

It would be really surprising to not have spoken to the guy who is effectively the public face of the organization and is its highest paid member of management.