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by _0w8t 1357 days ago
When the remains form surely they contribute to microlensing. But after they out of the visible Galaxy boundary, they stop. And given the end up 2-3 times from the boundary, they spent the vast majority of the time there without contributing to lensing.

Now consider that according to the paper 30% is going to leave the Galaxy. Those after the initial travel will never contribute to anything.