I think it's very early days to be making lots of these calls. The team has gone through significant change again this summer, and we saw how that means time to gel. We've got an exceptionally strong home record to build on, a strong (albeit recently shaky) defensive platform and have added some quality in the players we've signed. Yes the 2 away defeats are poor, and we need to be winning those games if we're to push on for top 6, but like I say, we need time to gel.
Silva proved he could look at an issue and come up with a solution when we were shipping set piece goals last season. So let's see if he can solve this issue too.
What are we actually waiting on to gel? We've not got a new system. We've not got a new style of play, or any new tactics. The back four were all here last year. The two new midfield additions have both been out injured and the new kid up top hasn't had that many minutes either. It looks like the 'significant change' you refer to is just attempting to play the same way but with an inferior player in place of Gana.
So far it's not been good enough, full stop. Let's just say it as it is and not try to overplay the mitigating factors.