So you're saying if we give McKenna 4 more years he'll end up having a season that is statistically the same as Gary Ablett?
Completely different sports with no bearing on the other and what requires a huge learning curve and a completely different set of skill sets. Tall ruckman coming in seem to be the few that do manage success coming in off limited AFL exposure, as a proportion of the awareness and smarts needed evaporate, and it mostly turns into ruck taps and just contributing around the ground best they can. McKenna might have talent but I don't think its anymore talent that any other potential AFL player and only as Essendon fan would think he's anything above average for talent, and that's being harsh but truthful. He has shocking awareness and positioning, slips over a lot and fumbles under pressure and has poor footy smarts for an AFL player. He might be quick in the VFL but he hasn't shown that yet and it's often be undone by bad decision making on his part. His kicking might be "good" but he hasn't shown that remotely at AFL level yet, and no, one good kick for every 6 doesn't count. People rave over an awesome kick he make by 9/10 it was a basic 40m pass that looks cool cause of his dinky kicking action.
I'm not saying not to play him as I'd rather play him over Howlett/Hocking etc and he does have pace and is young so he can learn, but we trying to play him as a running back where he doesn't have the onfield smarts to win enough ball and he's certainly not a dour defender. I'd rather us try him on the wing over Zaka tbh.