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?
You can terminate the wires in a junction box as long as the box remains accessible and has a cover. You might also label it with the panel slot #.
don't label with panel slot - too often you need to move things and so those are incorrect anyway
Yeah that's my original plan. Was unsure about leaving some wires up there not juiced
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.