Yep, we'd have arguably the two best defenders in the world. Rolls-Royce's. And at their ages, talk about setting us up long-term.
Don't think we have too many center backs mate. Stones, Akanji, and Ake are all turning 30 next year. They're also keen to an injury, which doesn't get better with age.
We have some B tier CB's in the system but we don't have an ace. Walker is gone in the summer. Really only have Gvardiol and Dias that'll remain fixtures in our side over the next 5 seasons. Rico's size prohibits him from ever being a game breaker in the best team in the world, but will be a nice rotation option if we keep him.
And what makes you think he isn't ready to step up and play in the first team? I think he walks into the same tier as our current lads. No reason he cannot rotate into different roles when needed.
Give your heads a wobble in signing wonderkids? We signed the biggest wonderkid in the world last summer in Gvardiol mate? Not sure what you're on about. Must have done too much shaking yourself?