Oh, I hope someone knows something! I wasn't expecting such a quick reply since it's been so long! I think I updated my tree on Ancestry to show the Stockton/Lacy connection. There is also a connection with Luke Short through Irwin/Irvin Lacy's wife, Sarah Brumley.
Irwin Lacy was born Kentucky abt 1837, but I can't find a family connection, there are several Lacy families in Kentucky at that time, and I have narrowed it down to a handful based on ages in the 1850 census, but I am not sure how to get further with that. Lacy lived in Texas abt 1860-70, where he married Sarah, then they moved to Colfax NM, and their children lived in Trinidad Co.
I did speak with someone at the Vermejo Park Ranch, and he said it sounds from the description in the deed that this land is now part of the their ranch, but still no way to narrow it down further, they don't have the records.
I am also very interested to find a photo of the Lacy family, Irwin in particular.
Good to meet you!