I would say from a very early age Davide has been around top class players.An interesting quote from Duncan about Davide Ancelotti in his interview, called him a tactical genius or something, also said Davide works a lot with DCL in training. I find that fascinating.
He has probably attended hundreds of training sessions as an observer while in his teens ,
He will have witnessed top one on one coaches in both attack and defense at work.
Probably hundreds of conversations with Carlo about football
Imagine all the top players he had access to .
Its no wonder he picked up a lot of tactical knowhow and I am sure Carlo made sure he done his badges with the best of the best