What's the deal with Whey Protein amino acid profile sheets?

[apod]

I was reading about proline-rich peptides, lactoferrin, and the benefits of IGF1 and immunoglobulins and wanted to get a feel for what the specs looked like in common whey protein offerings.

I was looking at a common brand of Whey Protein at my grocery store (Jay Robb) which lists 25g protein providing:
* 398mg glycine
* 4306mg glutamic acid
* 530mg methionine
* along with 125mg calcium and I'm guessing very little lactoferrin / immunoglobulins

Now, the bulletproof whey @ https://www.bulletproof.com/whey-protein-net-wt-16-oz lists 25g protein providing:
* 4,318mg glycine (why so high?)
* 575mg glutamic acid (why so low?)
* 557mg methionine
* along with 376mg calcium (why so high?) and unknown lactoferrin / immunoglobulins (it says 5x the "normal" amount...)

Looking at Xymogen's comparable product with colostrum (listed as being high in IgG) @ 25g protein, it lists:
* 625mg glycine
* 5,656mg glutamic acid (why so high?)
* 781mg methionine
* along with 100mg calcium + 2.5g of immunoglobulins @40% IgG

To get another data point, I checked out Well Wisdom (without colostrum), which lists:
* 710mg glycine
* 664mg glutamic acid
* 525mg methionine
* along with 133mg calcium and 3.2g of Immunoglobulins (higher than the one from colostrum sold as being high in Immunoglobulins?)

I was curious what Mt Capra's "Capra Colostrum" looked like or their Goat Whey, but couldn't find the specs. Is there really this much variance in whey protein?

[Rainbow]

I'd also appreciate knowing. I don't currently supplement with whey, but it's something that interests me.