A.T. Robertson Commentary Colossians 2:10

"and in him ye are made full, who is the head of all principality and power:" — Colossians 2:10 (ASV)

Ye are made full (εστε πεπληρωμενο). Periphrastic perfect passive indicative of πληροω, but only one predicate, not two. Christ is our fulness of which we all partake (John 1:16; Ephesians 1:23) and our goal is to be made full of God in Christ (Ephesians 3:19). "In Christ they find the satisfaction of every spiritual want" (Peake).

The head (η καφαλη). There is no other place for Christ. He is first (1:18) in time and in rank. All rule and authority comes after Christ whether angels, aeons, kings, what not.