Bill Starr has an answer to this in his book The strongest shall survive. he says
If an incomplete protein is eaten along with a complete protein or even with another incomplete protein, then they complement each other. It is important, therefore, to eat some complete protein at each meal for the liver only stores complete protein. If there is so much as an hour time lag between eating incomplete proteins and complete protein, the value of the incomplete is lost. So, in order to insure you are utilizing all the protein, even if it be an incomplete source, a bit of complete protein, such as milk, with each meal is in order.
goin on 4t - cottage cheese has all 8 EAA's. If you added that then by Bill Starr's definition you can count the oatmeal protein.
@gladiator - yeah that counts. The essential amino acids not found in peanut butter are found in whole wheat bread thus making a complete protein.
Here's something interesting:
40 years ago women started on an all-gelatin diet. Gelatin is lacking only two essential amino acids and is almost lacking three others. After some length of time the proponents of this fad diet came down with specific symptoms of ill health associated with protein deficiency.
If Bill Starr is 100% correct, then BCAA's are pointless unless you have a complete protein source no longer than an hour after. Although I don't know if the branched chain part has anything to do with needing other EAA's.