a.teixeira, post #2: Everything in the opening post holds. The case it does not cover is the one I have. Melanotan II is a non-selective melanocortin agonist, which is why its effects are not confined to pigmentation. The non-selectivity is the mechanism and not a side issue. I checked the source rather than the summary, and they differ.
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Picking up post #62: that is the part I would want checked first.
Where I have landed on Melanocortin agonists, having got it wrong once in public: the direction is clear, the magnitude is not, and anyone quoting a precise magnitude has borrowed it from somewhere that did not measure it.