There's risk attached to every signing, and I'm not sure there's really any obvious correlation with quality and what league they've come from.
It used to be a safe bet to assume anyone from Serie A would be rubbish, then Salah wrecked that.
It's probably correct to say that players we've bought from another Premier league club are less obviously going to be shit, but that's maybe because there's more examples of those, so there's more obvious successes - you could spend the rest of the thread identifying all the shit ones too.
Nobody knows anything.
You may have your obvious flaws but there's no doubting your logic here. Spot on.