As you touched on earlier in the thread, opportunity plays a role too. Draisaitl actually stated that season in the minors but got an early recall because Edmonton's offense was so bad. They had McDavid, Nugent-Hopkins, Hall, Eberle and not much else and were likely hoping Drai would click with McDavid, which he did. After those names, the rest of the offense was guys like Teddy Purcell and Benoit Pouliot, so Edmonton was a bit more desperate.
We have Kempe, Kopitar, Fiala, Danault, Arvidsson, Kaliyev, Moore all on our top six (assuming we don't add anyone else this off-season) so Byfield isn't likely going to be put into the top six too kick off the season. A more likely scenario is he builds into that role and the Kings role more of a three C system with Kopi, Danault and Byfield all getting somewhat similar ice time depending on situations and rest games, injuries, etc.
I think Byfield's numbers will start off slow next season too (he may come out of the gate hot like kids can but cool off shortly after) but then build up as the season moves along.