It's very hard to compare Evans with anyone when he is the only car with different tyres (well Østberg had same in Portugal).
Depending on your angle every time he does good it has to be a tyre advantage (Monte tarmac stages, Argentina, Poland SSS 3x...) or every time he does bad it's not his fault cause he has bad tires.
However, I do like what Ogier said in Argentina: tyres can give you an advantage but you still need to be able to use it and drive at that speed.