Sorry I haven't replied sooner - I've been away for a couple of days. Unfortunately work sometimes takes me away from this genealogical research.
I think the Huddersfield Horsfalls were another family altogether: I've looked at them before and can find no connection between my Todmorden Horsfalls and the Horsfalls in other parts of Yorkshire. Though it is possible that all the Horsfalls originated - way back - in Todmorden. There is apparently an area of Todmorden called Horsfall, and there is a Horsfall House, an old stone house whose picture someone sent me a while ago.
The link you sent for the 1796 Court Records is definitely worth following up: although James Horsfall was not an uncommon name, it was the name of Abraham's grandson, mentioned by name in his 1806/7 will - so James is likely to have been an adult at the time.
I think the next Horsall job for me is to make a list of all marriages involving Horsfalls with the names mentioned in Abraham's will, then to look at the baptisms to see how many children these marriages produced. There are patterns of names - Philip, for instance, turns up quite regularly in the later family story.
Thanks again for your interest and expertise
Ian