Thomas Leader of Ashgrove is the same as Thomas of Springmount.
I'd be very interested in the contents of Thomas's will Cathy, have you ordered it?
It looks increasingly certain that Thomas is the brother of my GGGG Gfather Nicholas Leader, (who is described as of Tullig, & Springmount), both sons of Henry Leader of Tullig who died in 1809, & who is buried at Kilmeedy with young sons Robert & Edward.
There is plenty of evidence that they had land transactions between them at the time Nicholas left Ireland for Australia in 1838,and also that Thomas was involved in the handover of Tullig to Abraham Morris at the death of Henry Leader Jnr about 1836.
It would seem that son Henry is from the first marriage of Henry Leader to Mary Kearney, & Thomas & Nicholas from a second marriage to Ellen (unknown) who seems to have died in Ashgrove in 1863.