Chapter 999 is one of the most important Luffy chapters in the entire manga. If you read closely, every scene is directly or indirectly proclaiming Luffy as Joy Boy.
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Especially Whitebeard’s decision not to pursue Kaido.
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Here’s how I see the sequence of events:
1) Oden and Roger discover the Will of D. and One Piece and realize they’re 20 years too early to be Joy Boy’s inheritors;
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2) Roger declares his son will be the man Joy Boy is waiting for;
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3) Oden refuses Roger’s assistance, vows to prepare Wano and “wait” 20 years for Joy Boy;
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4) Roger meets Whitebeard and explains the Will of D, Joy Boy and One Piece.ù
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