No, the one standing with the scar is Jonathan, Dio is the one on Jonathan's left in the first panel.
After rereading it appears you're right, my bad. In my defense it was very late/early when I read it and I thought only dio did that pose.
Updated
Jonathan and DIO #2And his younger brother is DIO.Jonathan Joestar.He pissed me off!I got a beef with DIO.Why!?Same age, 120 years old. They're not twins or related by blood. Heard he was adopted into the family. For some reason, he's got that strange star shaped birthmark of the Joestars.All right. I count me in.Great! Then it's decided!So I can smash that DIO's face in.Can't say I know the details.So that DIO is in Egypt.Heard the old man and Mom got their Stand powers because of this man's influence.An archaeologist. He's my great-great-grandfather. So, he's the old fart for my old man. He's 120 years old. Seems he's doing research in Egypt.