Sorry, I can't tell whether you had the right Thomas Corkill burials connected to the bapts, but they look likely. I'm not sure how old children were before they stopped calling them "infants" and it is possible that they included those aged 2-3, so you need to keep an open mind. [One burial could have been Thos bapt. 27 Dec 1733.] If you were looking at the film of Maughold parish register you will have seen that it wasn't usually very informative in the 1700s.

If you look through all the Maughold wills when you order the films you may come across siblings, etc.

Sue