Sure, but there's two things that Williams & Whyte share - they are not physically dominant players, and they are not natural defenders.
Two features that are shared with Winnall, Baldock, Taylor, Holland, Bodin, McGuane, Sykes, Henry & Browne.
Then we have a handful of players in our squad that have some defensive capabilities and/or like a tackle, but are not expert - Seddon, Cam, Kane, Forde & Hanson
In terms of players in our current squad that I would look at and say "Yes, that guy is a genuinely good defender" - it's Moore, McNally & Long.
I'm hoping we can add Brown to the list, but the jury's still out right now. That used to be true for Mous of course, but I don't know that you can say it any more given that he doesn't appear to be able to play 90 minutes. I have no idea what Smyth can do because I've never seen him play.
As a boring old pragmatist who appreciates the defensive side of the game just as much as flowery attacking play.......that's just nowhere near enough for me.