On ice results are not the only indicator of hard work.
And regarding the Captaincy, there are a hell of a lot of more things that are considered other than on ice performance.
Locker room demeanour
Willingness to improve on and off the ice
Oilers social events
fan relationships and player relations
intensity
team building
fairness to other players on the team
taking control of a game in certain situations
character
due diligence
bravery
Doing what the team needs you to do to better the team
(I know someone is going to pick apart this list like a vulture on a rotting corpse, but I forgive you )
Gagner has improved in many area's of his game, on and off the ice, including defense, over the course of his career so far.
You don't seem to want to acknowledge that for some reason though.
The guy has improved many aspects of his game every year he's been an Oiler.