YosefYosep throws out a question :** “In one of Aquinas’s arguments for God is the height of all perfection.
There must, however, be the least perfect thing.
What would that [perfect thing] be?”**
Yosef, you have not taken a class in Logic (and are probably much better off for it).
As far as people are concerned there is NO chance for us to be Perfect (depending on which definition of Perfect you have in your mind).
So, your hypothesis could be slightly re-written: God is the Source of all perfection… or, God is all perfection … or, All perfection is in God.