Thank you Brian and Sue !
Seeing the full marriage entry improves my confidence that it is the right Thomas, since he has the right father. But he was probably putting his age down, as he was baptised 20 Nov 1842, and I was hoping he would have shown as living at Ballacojeen, where he was living in 1871 and when their first child was born...
As for all the extra details about the Corkills, I am blown away with gratitude !