Explanation: To spell it out in no uncertain terms, I scan others to see if they can benefit from an upgrade or not. From my understanding, no one knows if they can be upgraded or not from the start (I do not even know if I can be upgraded), and the only way to detect upgrade compatibility is through my scan. I have come across two beings that can be upgraded and another who cannot. Kennigit is one such upgradable entity. Before the upgrade became available this day, I was at a loss as to what an 'upgrade' meant. Now it is abundantly clear to me what my exact role and purpose is.
Extrapolation: It is my speculation that only machines can be upgraded, whereas organics may or may not benefit from an upgrade. Furthermore, voting an upgrade to someone who cannot benefit from it is a waste, as 1) the upgrade will go unused or 2) the holder who cannot use said upgrade will have to spend a phase giving it to another, who again may or may not be able to assimilate the part into their systems, leading us back to item 1) and possibly again to item 2).
Conclusion: While giving the upgrade to Jarrema may work, it is also possible that he may not be able to use the item and will have to 'waste' a night handing off to another who as stated prior may also not be able to use it (thus preventing Jarrema from doing any other programed routine for that phase). I would consider that a great inefficiency to go through all of that trouble when it can be avoided, and I also consider upgrade parts a finite resource, as only one as appeared thus far.