Could it be possible that Henry married twice? I found only one Henry Pooler in Brewer in the 1880 census. Also, in the 1891-1892 Brewer directories, there is only one Henry Pooler listed. And in the 1930 census, I see that Henry was 24 at his first marriage, and Lucy was 30. As Lucy was younger than him, that must mean Henry married twice. I also had a Henry Pooler married to Lucy Ellen Libby in my database, but without parents. There may have been one who came to Brewer later, although he was the same age as Levi's son. So for now, I'll leave 2 Henry Poolers, both born c. 1863, in my database, but link the one married to Lucy Libby to Levi's family. But I suspect that they are the same man! :)
Interestingly, Lucy Ellen Libby's mother was a Pooler too.
By the way, do you have any information about a Lucinda Pooler who married Joseph Mutty/Thibodeau in Brewer in 1861? She died before 1864.