So, my conclusion:
Eli will remain Autonomous, mostly, though will be weaker as Autonomous. No use of soul wavelength at all. He will remain a sword, because 'dat backstory tho'. Will not really have a Meister because 'do not want'. If someone is dying to make a Meister for him, though, I guess he can be their partner, as well as fighting himself, Autonomously. 

Is everybody happy?