It would appear, your elastic band approach for interpreting verses, changes like the tide.
The Son = flesh Gal 4:4. His Baptism = that which us born of SPIRIT (God) is Spirit = He after the Baptism became Spirit Life-Giving 1 Cor 15:45 = giving of the Fathers words John 6:63, 3:34.
"Is Spirit" = But He was not a literal spirit there. But at the same time, deemed dead in the flesh context (Rom ch 8).