No. Giganter is 50%, RC is another 50%. IK activation is instant ONLY when you have 50% tension (or more), and it consumes those 50%. Regular activation (free one) is slow, so it wouldn't combo.
Well in videos from 2nd loketest Dusts were #re speed. But Dust now has a big red flash at first frame of start-up, so they'll be easier to block then in #re.
only to some 20F+ start-up stuff. but then opponent can YRC and nail you. and he don't need to wait for recovey even, just go different level as combo-starter so punish has quite a big window.