I am also skeptical of claims that Thomas Ellis who married Jane Hugh was a son of Rowland Ellis of Bryn Mawr. Below are links to two very thorough references that write extensively of Rowland Ellis, and also discuss Thomas Ellis (there may have been more than one Thomas Ellis in the area at the time). One of the texts states explicitly that Thomas Ellis was not related to Rowland Ellis.

https://dcms.lds.org/delivery/DeliveryManagerServlet?dps_pid...

http://archive.org/stream/welshsettlemento00brow/welshsettle...

I am descended from
Thomas Ellis and Jane Hugh
Enos Ellis and Elizabeth Coleston
Rebekah Ellis and Benjamin Pickering
Enos Pickering and Elizabeth Harrold
Benjamin Pickering and Sarah Mills
William Pickering and Huldah Stanley
Ida Mae Pickering (my grandmother)