Whose picture does Ponyboy see while going through Sodapop's old yearbook? Why doesn't he recognize the person immediately?

HERE

Explanation:

For the first time, Ponyboy wonders about what Bob Sheldon was really like after glimpsing his picture in one of Sodapop's old yearbooks. Bob's dark eyes reminded Pony of Soda's and the Shepard boys' and Johnny's eyes. He wondered what Bob had been like--that he liked to pick fights, that he was a buddy to Randy

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