Offensive production is more than just goals. Lots of guys put up goals but zero assists and can't play defense so they end up in the bottom 6.
Like who?
Who are these "bottom six players that score 30 goals in a season but are on the 3rd line"?
There's maybe like a tiny handful players like that in the NHL.
It's not like Alex Chiasson and Zack Kassian (this guy routinely whiffs on getting the puck out of his zone like 2-3 times a game causing a tire fire for our D) and Sam Gagner were defensive stalwarts yet they've all gotten extended play time in the top 6.
Athansiou has played 1 and half game total in our top six and had two points in that time, that's a fact.
2/3 points that Ennis has (who keeps getting top six time) are from Athansiou directly. His goal is set up by Athanisou and 1/2 assists are from Athansiou scoring a goal that got the Oilers a point in Anaheim.
If Kassian, Gagner, Chiasson, Ennis can be given chance after chance with McDavid and have little production to show for it, AA should be given another try with McDavid at least. He really should be tried with Draisaitl as that's likely the most ideal candidate for him but line politics becomes a thing.