This all on same breaker. Left, spliced wires are hot, but do nothing and there's no switch for them.
Wires on the right are on a switch that controls two other lights closer to the breaker.
Can I just removed the splice and terminate the hot wires into a box mounted on the rafter?
i think the spliced goes to these wires, then leads somewhere else?
My preference is to always remove wires that aren't powered to the greatest extent practicable. You don't want someone in the future deciding they can just randomly use the wire and burn the house down.