I don't think any airline is obligated to provide the perks its codeshare partner provides to its elites. CO codeshares with DL, but DL doesn't offer EUA to CO elites. CO codeshares with VS, but they don't do squat for CO elites. And so on.

Also, I'm pretty sure KLM is now 2x50lbs for flights to/from North America (and 20kg TOTAL for intra-european flights--not sure about Europe-Asia).

Oh, and I'm sorely disappointed that this isn't another "fat people suck" thread.