When it comes to people and/or genealogy one can expect anything!.

In this instance I will have to record the 1827 Thomas as being an ancestor
even though I cannot find a marriage or death that will match.

I use GenoPro and can highlite his record in a different colour which makes
it stand out so that future generations can decide for themselves.

Yes you are quite correct in showing that duplication of a christian name
by parents can and does occur.

Thanks again for the comments.