Why not just casien? Mix it with some whole milk and the fats will slow digestion down even more, not to mention it makes a great F'n pudding, which nothing beats before bed
Thats not your question though, you are asking if the whey will get trapped in the casien gel and therfore also digest slower. Hmmmm... Interesting theory...I know a lot of guys used to put one scoop whey/one scoop casien in a post workout shake to get the best of both worlds. I think the guy who played THOR was just pitching that theory as well and he did a pretty good clean bulk for that movie.
If you look at his training regimen it was actually pretty decent. Big calories, heavy squats, heavy deads, not your typical hollywood bullsh*t. I would be curious to know if there is any truth to your question but.....
I guess my main question would be why not just casien? Is it so you can mix it to a drinkable state? (I know straight casien does NOT mix well) Is it because the the biological value of whey is higher? Or is it just for the hell of asking?