Roger couldn't beat Garp??? roger was figthing defensively against Garp and never wanted any of them deadIf this is true, then why could Roger never beat Garp. It has been specifically mentioned that they have fought several times at par.
Since you have made Shanks and Mihawk bold, I think you are trying to send a message here. So, a different of 4 means nothing to you. Looking at the chart, Issho could fight on par with Shanks