Re the type of players Koeman wants, then I'd say it ties in with a requirement to move up from 11th and challenge, properly, for the top 4 within 3 years.
Mahrez, Vardy in particular didn't work out straight away so those types (or even relative ones) aren't really suitable for what we're trying to do.
Although players like Sandro, Klaassen, Vlasic, Keane, Pickford aren't the finished article by any means.
I do think that the striker criteria was really narrow though.
We basically wanted a big target man striker who'd get a decent amount of goals and also bring people into play.
The only way to guarantee that was to target someone who has consistently done it.
That is really narrow and explains why we waited on Giroud for so long.