Mihawk isn't strong as Shanks

Mihawk bounty is inflated

Fighting Mihawk for years couldn't make Shanks to be a yonko candidate even
Beating Loki made Shanks be a Yonko
Mihawk stopped fighting Shanks when he lost his arm. After that, he became a Shishibukai with a bounty of 3,590.bi frozen, without being a yonkou. If Mihawk had been defeated, like Loki was, then Shanks could have become a yonkou. But Mihawk himself acknowledged that he stopped being a challenge without his good arm.
Now, Shamrock probably uses devil fruit as a supplement to be strong. Neither Shanks, nor Mihawk, nor Oden, nor Roger, nor Ryuma, nor Zoro need devil fruit to be strong, which lowers expectations for Shamrock's sword skill (haki included).
 

Reborn

Throughout Heaven & Earth,I alone am d Honored One
Get rich like Elon and do those hair transplants
If you still got hair buds maybe a microneedle can help
Well I tried finasteride+ minox+biotin for months

I got hair transplant as well. But thing is you need hell lot of money to maintain it or get really good transplant with 2-3 sittings otherwise in few years whatever hair you got after transplant will fall again or become less denser.
 
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