I've not seen enough of Sels, but Elliot and Darlow? Come on, man. He's in another league to both.
The Krul of a few years ago was, yeah, without question. He's gone backwards massively since though imo and I can't see that much of a difference tbh. Not quite sure which Tim Krul people are harking back to sometimes.
The one who's get serious deficiencies but is still easily a PL goalkeeper. Elliot isn't and Darlow isn't yet.