Ok you say 195 att speed+ coma,why not lower the att speed? 180/5, or nerf the items that inflict coma,there are plenty of other ways to solve this problem without adding the immunity to GTB.
Also GTB has never blocked any status effect,it only blocks what gets added to the script the original script for the card doesnt block status ailments.
Just another thought,if everyone wants immunity to coma ,why not just add a new card that gives just that,instead of making one card do everything.