In working on my list of immigrants with dates, I discovered a potential reference to an ancestor on a passenger list that I had never located before a few years after he immigrated. The name combination is very rare and the age is close enough to have been my ancestor. The earlier immigration matched his year of birth and the "family story" of his age at immigration so I never thought to look for him in other passenger lists.
Immigrants did go back home only to immigrate again. It might be worth your while to see if your ancestor was a double-crosser of the pond.