Rupp lists him on the Peggy, but Strassburger has three lists for the Peggy and he doesn't appear on any of them, which is a shame, given that one of his lists provides ages.
The date on the profile appears to be an estimate, so he could be the same man. As long as he was born in 1737 or earlier, he would have been at least sixteen and thus appeared on the list.
A sixteen year old could have traveled alone, without family, particularly if he was indentured.