Re:Looking for BCAA vs wheyprotein/normal diet studies....
In terms of studies - good luck finding them.
However, as this touches on my own research I will add what I know.
leucine has an independent anabolic signalling effect and positive effects on protein turnover when measured in studies - and that is regardless of diet protocol and type of athlete.
BCAA's again the evidence there is points to positive effects on protein turnover and some effect on anabolic signalling such as mTor as found with leucine although this is less pronounced.
However, within this context, the best effects are achieved via the addition of leucine to whey and simple carbohydrates post workout in terms of signalling and protein turnover. Notably anti-catabolic effects are not very pronounced for post-workout nutrition with cortisol levels pretty much unaffected, although effects on subsidiary makers of catabolism are present.
If you want references then I can post the entire list if you want - but thats the summary :)