While I'm not certain that there is going to be a flashback, the premise for it can still work, even if VP has only second- or third-hand knowledge. Oda can still show only a handful of events that VP more or less knows happened to JB, and, on top of that, Oda can be his Oda self by using VP's uncertainty regarding the events and/or people... wait for it... to keep everything in silhouettes!
I think he gonna show some silhouette
 
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