Guys, look at this situation this way...
Yes, His Best Vocation is Ruby's Servant...
Servants especially in anime have like super skill that complements/assist their Master
That means Lloyd's Skills are meant to complement Ruby's... Which would mean Ruby would suck at everything He does best. His extremely potent magic could have resulted because of it
That said... Theyre humans and are free to a fault (maybe some not discovering their talents)
Lloyd could just NOT be ruby's servant. He has the skills to make Ruby shine. But He doesnt want to be one. It doesnt make his skills disappear
Therefore Ruby is the only one losing here.
Smart aint it