Very nice mon indeed.
As an attacker he will do what you need him to just as he is.
As a defender, he will never get the CP level needed for gyms and will always be at the bottom...unfortunately.
In the future it might change, so perhaps 'save your candies' is fitting for this one.
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Yup I find it as valuable as Snorlax w/ ZH/BS. Hits so hard as a defender.
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I would not.
If you max his cp, then he becomes less efficient to prestige a gym.
In this case it is best to "save your candies".