You have to take into account the situation with Roma.
They have obviously been keeping a close eye on Everton but unable to make any official changes.
Whereas at Roma, they have sacked a icon, picked a scapegoat as manager who struggled instantly then backtrack quickly to install a club favourite.
I think they thought given how badly we have been run, Dyche has done well and despite how terrible we play, he has done well.
So I think they thought he will be fine for the short term then in the summer we'll make our move, just like they did with Roma after the sacking Fonseca despite finishing 5th and getting to the Semi-Finals.
Now we are entering a real problem, we have just been taken over and the plan A is failing quickly. Dyche needs wins and this FA Cup game might be the catalyst BUT he has to find the formula.