As are all the best CBs? You don't get to the top of the food chain if you're lacking in 1 of those departments.
Guehi is well protected at Palace and doesn't have to cover anywhere near as much space in his defensive third as someone like Ibou has. Wait till he steps into our shit show and he's hesitating whether having to be dragged wide or into midfield because we're so disorganised, it's going to be a shock to his system.
Were Hyypia and Terry known for being quick and agile?
If you go further back, Tony Adams, Keown?
Was Carra quick and strong?
How about Matip?
I think the best CB's are the ones who can read the game well.