Well as expected Oda was going to hype Shanks' haki through the roof as the only original yonko without a df, a former Roger pirate who inherited his hat, same Roger who Kaido stated conquered the world through his haki
- Future sight
- Divine departure like Roger(who Oda stated was infused with adcoc)
He'd probably have the next best thing in terms of haki before the moment Oda will decide to focus on Pirate King Roger, and I think Prime Whitebeard as well(he has some hints of great observation or conqueror haki)
Interestingly enough as well, although haki is part of swordmanship, in Mihawk's bounty reveal, only the sword skill part was mentioned to be higher than Shanks, guess it's a way for Oda to keep the debate alive lol
What I also find interesting is that Shanks is using some abilities Luffy learned on his way to grow stronger and reach yonko lvl