Well, it would help if you read the ingredients or the Grow! thread. Grow! contains whey and micellar casein. Basically a milk blend with micellar casein - a very high quality protein - learn more on the special reports thread.
As far as glutamine - well, all complete proteins have glutamine, it is an amino acid - Grow! just doesn't contain any extra. As far as why, check out this article -
Doesn't anybody eat FOOD anymore? I don't know anything about that weight-gainer but most are notorious for putting on too much fat. You're much better off getting calories from food. Check out the 7 habits article and massive eating by Dr. Berardi. The links are in this thread: