10   For it became him, for whom are all things, and by whom are all things, in bringing many sons unto glory, to make the captain of their salvation perfect through sufferings.   11   For both he that sanctifieth and they who are sanctified are all of one: for which cause he is not ashamed to call them brethren, ~ HEBREWS 2:10-11

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For he hath made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him (II Cor 5:21). Paul is showing us the humanity of Christ, even in His resurrection, because it took the suffering to bring Him to perfection. Perfection is not a sinless condition because Christ had to no sin, but He had to become our sin (made Him to be sin for us) that we could be sanctified, set aside for service, as He is. We are all ONE. He is Word made flesh, not “sinful” flesh, but Word with a body to express Himself. We are flesh made Word in a process that leads to Him being preeminent, which is how He saw us before sin began.