Bahamut-ZERO was the only thing I got from those. haha. I got the one summon, and just assumed that was all they were for. Well, i'll take the accidental insight about crystal colors at least.The classic "crystal colors" are probably intentional as far as the Huge Materia goes, at least. You get Bahamut ZERO rather than a "Master Support" from blue, so I imagine it was a conscious decision.
I'm sure I'm missing a ton of stuff in FF8 too. There's no gaps in my GF lineup, but there's a bunch of empty spots past Alex and I've pretty much stuck to the story, so there's got to be side stuff I've missed.