First of all, maybe take a look at the horns of Punk Corna Dio, it’s obviously CoA.
Oda just made sure to focus on the awakanings in the fight against big mum.
But ok, let’s assume he doesn’t have it. Than he can Tank Kaido, Big Mum, sever injuries by Hawkins hacks and Bigger Mum without any haki and is still able to overcome her. Without haki.
How strong shall he get, when he comes this far without any haki using, while it’s confirmed he has all 3 forms?