We've been well served with centre backs over the years.
I would add to the list the partnership of Dann and Delaney which was very solid.
As an individual, I also rated Craig Moore who was a footballing centre half with a teriffic spring despite not being the tallest.
I think Guehi and Anderson are the best footballers, McCormack and Blyth the most uncompromising, Dann and Delaney the most dominant and Cannon and Gilbert were very good all rounders.

Ninja and Thorn were very different players but both excellent. Jim Cannon was good for years, even in a poor side at the end of his career. Gabbidon, Cahill, Dann, Delaney, Cahill, Tomlin's even Kelly and Hill - all have done well for us over the years. The last poor one I can remember is Ruddock but even he wasn't bad when he started.
I think Cannon maybe shades it with appearances and longevity. I couldn't pick between the others for second. Loads of decent ones over the years. I'm probably purposely forgetting some awful ones. Was Fan Zhiyi a centre back too? - I expected him to fail but he was decent too.

Red and Blue Army!

Jeff Hopkin & Leif Andersen? Not sure they played together luckily!

They're justified, and they're ancient
And they drive an ice cream van