Hull were dead and gone when Silva took over. He got them very, very close to safety. Didn't force a style on their side and played a way that suited the players he had available. To get them close to safety was an achievement in itself.
Watford - he had them flying right up until our approach. Even after that, they picked up points. It was the game against United that it fell away a bit and then the ongoing rumours around us. It clearly turned his head, we were offering huge money and we are a far bigger club than Watford. That's when the players started sensing something was amiss (this isn't news btw, it's been well documented). His relationship with the Watford board vanished and they sacked him - that decision cost them close to £12m in the compo we'd offered.
Silva has won things in every other country he's managed in. He did better, comparatively speaking, than Fonseca while they were both in Portugal. He was heavily linked to the Benfica job after he left Watford, and turned down roles at Southampton and Stoke. He wanted us and will know what Moshiri wants of him.
He's not perfect, no. But he is a very promising manager and exactly the type that fits the bill in terms of what we need.
Emery? He isn't really amazing. He did well with Sevilla under Monchi - well, very well, but couldn't hack the step up to PSG. He also doesn't speak any English, which is bound to end up being an issue that would be picked up on should he not hit the ground running. There's also question marks over whether he'd think himself too big for the job.
Tuchel - had the PSG job in the bag for six months. Shame, although he's pish defensively like.
Fonseca - no more proven than Silva.
Conte - no chance, plus he's an egomaniac. Would take him in a second, but if he hates living in London, no chance he's moving up north and dragging his family with him.
Pellegrini - interviewed in 2016, Moshiri wasn't keen. Has been in China and now looks set for West Ham.
Favre - off to Dortmund.
Let me know of any others I've missed, those are just off the top of my head.