All speculation.
The small barrier is too tough for Sukuna to break before he takes damage as per canon.
We smoking the Sukuna pack this week
No. Sukuna already broke Gojo domain and slashed Gojo like twice. Gojo only used small barrier after those.
So, if sukuna used real CT from the start, fight would be way different.
>Gojo takes more damage than basic slashes.
>is forced to heal his body more.
>delay in getting his domain backup
>even more damage.
And not to mention, if it only took 3 minutes for slashes to break the small barrier, you bet your ass the real CT would take much less time.
Basically, Gojo barrier would just be broken before he could do enough damage against a sukuna that's not using anything but slashes.
And in the end the result would still be Gojo frying his brain abusing RCT CT heal. Where as Sukuna would never have gotten hit by UV. So he'd be fresh.
Gojoever...