Rough opening..overthinking?
No need for the jack studs to be PT, In a basement that has no water or moisture issues, using PT material for plates is just a precaution, not a necessity, IMHO. This has been my experience in demoing older work while remodeling. BUT for what its worth,  hold the jack studs up off the floor a little, say 1/8" just for the heck of it. If I think about it, I set a little construction adhesive where the end of the jack stud goes and set the end in the glue to bond it to the floor and seal the end. If you have the studs set, do not sweat it.