Who is saying Kelly isn't worthy of his position in the team? Because they're as wrong as you are about Lever being able to match up on Dangerfield.
If you think Lever is strong enough to beat Dangerfield I suggest you actually watch a few games mate, he gets regularly pushed around by guys with less strength than Danger.
I would say Lever is actually as strong as danger agilty wise no or speed no. But if Danger plays we all know he wont be 100% and after listening to him last night it will be both his agility and speed affected by the foot injury, he will play inside the 50 mostly which will suit lever and the fact Lever has the reach on height on danger he will be the perfect match up for a below par Danger playing as a stay at home forward.