Evans was literally on everyone's radar the season prior to signing for us, but they wouldn't pay £30m (which we didn't either) and offer him the terms we did. We nipped in after everyone had gone and sorted themselves out with other signings and West Brom had been relegated. He was definitely on Man City, Arsenal and others radar though so it's not like we are some Moneyball like sage's who always spot potential when no one else does.
Daka was scouted by Liverpool constantly alongside us but we've moved first and with more intent because we need him more; they've got Jota, Mane, Salah, Firmino, Elliot. We had more requirement for firepower. They're spending their money on Konate so that they don't suffer the same defensive fate they did last season and they've tied everyone down to longer term contracts who is any good.
For every Mahrez we have a Ghezzal, Musa, Bennett, Diabate, Slimani, Silva, Iborra. In fact you could say that despite the publicity, we get it wrong easily as often as we get it right.
Therefore it's not ridiculous to suggest Vestergaard might not be a great signing.