Why did Jacob appear as a child when he had the ability to appear as an adult as well? (poll 3592457)

Why did Jacob appear as a child when he had the ability to appear as an adult as well?

To remind MIB of their childhood together

It wasn't Jacob: it was a different entity appearing as him

To provide a new mystery for Season 6

Jacob could only appear in his adult form to everyone once he had his ashes

Something else

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