Depends mate, my own thinking on it, would be as follows.
IF we wanted Silva as badly as it seemed then now he is available we should go out and get him unless one thing happens, a manager who system/style wise plays very similar - but who is a better version of him has become available.
So for arguments sake, Fonseca stock has risen hugely the last 3-4 months, he plays attractive football as does silva, both play similar systems, etc, then yeah can see the reasoning behind that move
IF we suddenly went and hired a Dyche, LVG style manager - defensive orientated etc then it would scream out we have absolutely no clue as to what direction we want to take the club.
As i said earlier though, we could have gotten Fonseca and chose Silva as the one we wanted back in October, obviously since then each man has gone in different directions, but being willing to pay 15m or whatever and all the bad press that came with trying to prise Silva out of Watford, it seems odd that we end up going for someone we could have gotten with little of the fuss, with none of the mess thats come with going for BFS as manager etc.
and honestly just shows that we either have too many cooks in the kitchen or possibly we have a crazy Iranian chef in charge.