To be fair Walker and Laporte (pre-injury) were considered to be among the best players in Europe in the respective positions.What you are not taking into account, imo, is that most top teams who bring in 23 year olds, are bringing them in, to play with their established legend(s) & learn how to take over from them.
We don't have one. He's gone & the others have so far failed to live up to him.