Your observation that Michael was the only son of Pierre and Antoinette is agreed upon by every other Palmateer researcher so far, so there is a very very good chance that it is correct.
Indeed it is fortunate that Michael did not perish on the journey here because so far it appears that Pierre and Antoinette are the progenitors of many many American and Canadian individuals, just by having the one child!!!
I would be really interested in getting more information on your connection to Pierre & Antoinette as would a few other people researching the name. If you would like to contact me direct, my email is firstname.lastname@example.org