Last point you make is why although I'd prefer Fonseca, i would have very little problem if we did get rid of BFS right now and go hire Silva, his 'fall from grace' was very much influenced and precipitated by us and our interest, give him a 3 year contract with us having a two year option to extend on it, get him an actual DoF who shares a similar 'philosophy' and back both of their decisions re who comes in and who goes out.
My own choice would still involve bringing in Arteta as assistant manager to whichever way we went though, someone who does know the club/fans and city, and who is very highly rated/touted for a managerial role down the line.