mixing casein and whey

I have read a lot that mixing gives you the benefit of the faster digesting whey and the slow digesting casein. however i also read an article that argues against this. it says:

"I know what you are thinking, 'Why not just mix them together and get the best of both worlds?' Well, I am one step ahead of you. Casein has a unique property, in that it coagulates in the stomach.12 This causes other proteins to be digested and absorbed much more slowly.

Have you ever tried to run through a vat of tar? It isn't easy by any means. You would be moving very slowly. Casein does the same thing to whey, and other proteins for that matter. Think of it as a sort of binding gel.

This simple little fact would nullify the biggest and most important attribute of whey. That is its ability to flood your system quickly with amino acid and stimulate protein synthesis."

what do you guys think?

here is the source:
http://www.bodybuilding.com/fun/satternorton.htm

This article only addresses the relative speeds of amino acid dispersal into the blood stream ... it does not take into account the difference in biological value between the two protein sources or most importantly, consider the desired "end result" ie which protein load method gives the best lean mass increases / strength increases???

I have read many times that a combo-protein approach is best for day-to-day protein supplimentation that leads to the best / quickest mass and strength gains. Post workout protein supplementation is the only time where (logically anyways) casein may have drawbacks.