LOL. Pot, meet kettle. You pick out 1 of the 6 things I listed.
Skinner's offensive skill, particularly goal scoring, is considerably better than Eberle's. His ES goal scoring is elite. If you can't recognize that, then that's on you. He has shown he can drive offense and score no matter who he plays with. Eberle has scored playing with some of the top players in the NHL (Hall, McDavid, Tavares, Barzal). Skinner has done it playing with Derek Ryan and Victor Rask. First season he gets with an elite center and he puts up 40 goals.
I do agree that the difference between the two isn't as great as the contracts they got, but they shouldn't be paid similarly at all, nor do I think they are similar players as you suggested. I guess if you want to just look at raw points and ignore everything else, that's fine, but it's a pretty lazy way to do it.