What is the question?
Q: "Who do you believe James 1:18's "US [/WE (depending on version)]" refers to (...provided you don't think it refers to either "Jesus" or "the 144,000" [...]) ?"
...and then I quoted the verse I'm referring to:
"having counselled [or, of His own will], He did beget us with a word of truth, for our being a certain [G5100 (or, a kind) of the] first-fruit of His creatures [or, of His creation]."
...and then I mentioned:
"['a CERTAIN [G5100] [of the] firstfruit' would mean a particular one, of several distinct 'harvests,' as I see there to be in Scripture (not to mention, in nature)]"
https://biblehub.com/text/james/1-18.htm
... my question being toward the TOP of this present post, if that helps.