Is the right answer.
It's no coincidence that Silva's worst season, ravaged through injury, has resulted in us scraping 4th place. With a full fit, on song Silva we tend to challenge for the league.
There's room for both players, Guardiola won't be using traditional standard team shapes, he'll change from game to game. Sometimes he'll change shape 2 or 3 times a game, so there is plenty of scope for both players to play in a variety of positions.
KDB has a big future at the club, but so does Silva. Those writing him off have got short memories and I assume are a little insecure.