Yes, as the first man Adam was the natural head of all the Elect,
so is Christ, the Last Adam, the Head of His Elect Spiritual Seed.
Amen, and excellent work on this series "Because we are Sons!"
Just to recap:
So, the reason why Christ was made under the law Gal. 4:4-5, was for the purpose of Him being the Kinsman Redeemer
for every one His Brethren Heb. 2:17 who were under the Law. So God sending the Spirit of His Son into our hearts Gal. 4:6
proves that we are His Adopted Sons Eph. 1:5, and the evidence that we belong to Him from Everlasting Eph. 1:4.
Appreciate you for taking me through this excellent study in the scriptures! ☺