I bet the whitebeard scar was caused by Roger
When Whitebeard first sees Luffy, he asks if it's Shanks's hat
While Whitebeard already knows that he is the original owner of Roger's hat
In fact, most people know that the hat is Roger's, but they point to Shanks because they mostly saw it with Shanks
This also applies to Shanks himself. He was a member of Roger's crew for about 14 years, and his fighting style, mannerisms, and clothing (hat) are similar to Roger's
It's clear that any old person would be more reminded of Roger when they see Shanks than Ace
