If City had 4 full backs 2 left and 2 right with Kyle Walker's exact attributes we'd be the hardest team in Europe to beat, in my honest view we'd probs already have won a UCL that's how good 4 of him would be and I reckon we need full backs like him they're the future... If they're technically good that's just a bonus.
Kyle Walker for me is extremely underrated in general by the neutrals at least or those in media.. he's hands down England's best right back and best in the Prem it's not even a contest, he might not defensively be perfect but he does the dark art things a right back should do.
I honestly hope Walker doesn't lose much pace until his mid to late 30s in the same way Cafu didn't... Cafu wasn't rapid but he was fast and seemingly didn't lose much pace until about 38, with today's nutritionists and sports science I really hope Kyle keeps his pace cos we're gonna have a terrible time replacing him.
There aren't many full backs as powerful and pacey as him and for me it's what we need in that area, if all our fullbacks were that quick and determined/lionhearted just like you say, then people wouldn't be questioning our defensive midfielders as much, and even though I'm not a fan of Rodri, he isn't the main reason for our defensive shortcomings we lack explosive pace in the wider defensive areas, Cancelo is fast and offers something different in the attacking 3rd at times but I'm talking explosive pace that helps out defensively, our other defenders lack that explosive pace or switch off though Cancelo is quick but he defo switches off too... Mendy lacks pace after injuries and switches off Zinchenko doesn't really switch off his concentration, that's why Pep likes him but he doesn't have the pace.
Anyway what I was saying is Kyle Walker is genuinely one of the finest fullbacks of his era of even the Prem era, and is genuinely the dogs bollox these days as far as what a top class full back should offer his team.