It's a lazy argument because you're using average disposals to establish the value of a key forward.
Disposals alone shouldn't be used to determine the value of any player, let alone a key forward who naturally gets less of the ball.
Of far greater significance is what he does with the ball.
I don't disagree with you that Levi is hugely disappointing but there are far more accurate ways to demonstrate that than by simply pointing to the average number of disposals he has per game.
Why you chose to add Daw to the comparison is baffling. Firstly .3 of a disposal is an immaterial amount, secondly they don't play the same role so a direct comparison between the two is completely irrelevant.