I will answer your second Question only because the first seems very complicated and technical.
Were the Father and/or Spirit also in Him?
Answer: yes the Holy Spirit was in Him, no the Father was not in him (he was in Him in a metaphorical sense though) He was in heaven.
Luk_3:22 And the Holy Ghost descended in a bodily shape like a dove upon him, and a voice came from heaven, which said, Thou art my beloved Son; in thee I am well pleased.
God the Father (voice from heaven) is in heaven and The Holy Spirit descends upon Jesus. Simple and straight forward. all other arguments are just metaphors for example
I and my Father are one.
While reading the Bible go to the clearest passages before going to the metaphoric ones. For example when studying the state of the dead do not start with the parable of Lazarus and the richman (please don't that's a parable you can find clearer statements which talk on that issue)
If you anyone does not agree here is a passage for you:
John 14:23 Jesus replied: If anyone loves me, they will obey me. Then my Father will love them, and we will come to them and live in them.
Obviously this is metaphoric because Jesus is in the Heavenly sanctuary now:
Heb 4:14 Seeing then that we have a great high priest, that is passed into the heavens, Jesus the Son of God, let us hold fast our profession
Heb 8:1 Now of the things which we have spoken this is the sum: We have such an high priest, who is set on the right hand of the throne of the Majesty in the heavens;
Heb 8:2 A minister of the sanctuary, and of the true tabernacle, which the Lord pitched, and not man.
When He finishes this ministry He will surely come again...
Rev 22:12 And, behold, I come quickly; and my reward is with me, to give every man according as his work shall be.