Although I didn't want Martinez or Koeman, Silva is different to both.
He has built no goodwill, has no credentials/profile, is a bore and the only trends you can take from his managerial career to date are negative around his inability to setup a defence to deal with basic set pieces, predictable playing style and complete collapse of form/lack of resillience.
The only argument for keeping him is around continuity and that is because of Koeman (better record) and Allardyce (better record). Koeman and the interim appointment of Allardyce shouldn't hamstring the club.
He was a gamble. I admired the gamble because it showed Moshiri had some longer term thinking for once rather than flavour of the month and wasn't discouraged by his collapse at Watford. But the gamble hasn't paid off and most significantly, shows no signs of ever looking remotely like it'll pay off.
There's no bigger picture here, he's just not good enough and out of his depth.