I think it just means the “combined” gems add more than just a certain thing like speed or strength. I added the blue one, forgot the name of it, to my PU Collins and it boosts his acc, awr, zone, and rec, plus a couple more I can’t think of. It’s a more broad boost.
Basically they TL the first 3 and combine them to form th other 6. All are available. Just weird how they advertised it. Jut think of it as all 9 of those available. Just many combos to try and customize your player a certain way. Just like any other abilities. 1 at a time