I don't know much about Zero-G combos tbh, but the main reason why that combo isn't used in BB-10 is because it isn't meant for BB-10.
From what I can make out (I've been away for long and know nothing about the Zero-G meta), that combo in the Zero-G might be a Wobble Attacker or something (Wobble Anti-Attack kinda).
The same type of combo in a BB-10 would need something like an RF/R2F to serve a similar purpose.
GF and GCF are plastic tips that move quickly but do not provide enough grip- which is disadvantageous in a BB-10 (they can be easily knocked out; they may self-KO if they fail to catch the Tornado Ridge, etc etc).
The rings around these tips hardly serve a purpose in the BB-10, so these tips are comparable to a WF really...
So mainly, it's the tip causing the trouble.
EDIT-
Oh whoops! I got my terminology wrong!
I meant to say Sway Attacker but I called it Wobble Attacker (because it makes the stadium wobble? Idk how I got confused there)...
Thanks Leone19.
Team IB Revolutions
Thanks to N0body for the avatar and Synth for the signature!