Chris was the closest, and thus most tainted by the dew, yet to this day there had been no ups and downs.
Their Life Rank was too low to carry on Wayne's lineage.
It also wouldn't rule out another possibility—that Wayne was no longer human, that there was a reproductive barrier due to a different species.
This possibility existed, but it wasn't likely.
Veronica had Dragon Blood, which was famously indiscriminate, overflowing with just a bit of rain water; even she had no ups and downs, suggesting the likelihood of a reproductive barrier was not high, and the disparity in Life Rank had to be the reason for deeper investigation.
Wayne could sacrifice himself, confronting Juno with a chaotic creation, but then what? If no results could be produced, would he keep freelancing indefinitely?
How embarrassing would that be!