In their prime?
Micah Richards in the 1-6 was leagues better than zaba ever was, and I love zaba. I think that performance was certainly better attacking-wise than anything walker has ever done but didn't have to do as much defending - for nostalgia, ignoring his punditry, I go 1-6-richards.
Dias and a fully fit stones is probably the best partnership we ever had given the stability alongside the insane attacking variable with stones in the champions league season.
And ake. Best defender we have ever fielded at leftback. Gvardiol on his day is getting there but give me Ake over kolarov, gvardiol, clichy, Mendy, garrido, ball, sylvinho, Delph, zinchenko, etc.