He's already shown he can elevate brown beyond what kopitar could do this year (without AA anyway).
It's when he was thrown ANOTHER anchor in AA this shit started coming undone. No center in the NHL can outskate those problems.
Can see the stats here:
Line Stats - Natural Stat Trick
Summary: Byfield Brown > Kopitar Brown (albeit much smaller sample). AA is an absolute drag as an individual. Brown is plodding along but not awful individually. Kopitar is awesome regardless, but much better without Brown. Byfield is absolutely unstoppable without those two.
Also Byfield with AA is awful...but Kopitar with AA, as an illustration--
22% cf% and ZERO goals for percentage.
Again, Byfield has PLENTY to learn...all he's gonna learn from Brown and AA in combination is how to drown.