Jesus also said "the Father is greater than I am"...what do you make of that? If you apply the same meaning to the words above, then you have a dilemma.
”God is greater than all” within the context of John 10:29, and that is, greater than His enemies. In the context it says, “no one is able to snatch
them out of the Father’s hand” because “God is greater than all” His adversaries in reference to verses 10-12 “the thief” “a hired hand” and the “wolf” known as the devil and his angels.
JN 14:28 “ You heard that I said to you, ‘I go away, and I will come to you.’ If you loved Me, you would have rejoiced because I go to the Father, for the Father is greater than I.
You assumed that the meaning of the word “greater” here in John 14:28 is the same as the one in John 10:29. Yes, it’s the same word [greater/meizon SG3187] but they deliver different meanings within the context or in a sentence where the word is being use.
Therefore, you cannot make a conclusion then that the Lord Jesus Christ is the same or part of God’s adversaries in John 10:29 because they use the same word “greater” in John 14:28. If you do, and I think you already did, then you would have the same thought or thinking as the Jews in verse 20, “Many of them were saying, “He has a demon and is insane. Why do you listen to Him? John 10:20”
So, your interpretation of “greater” between God/Father and the Lord Jesus Christ is about inferiority and therefore there is no equality between them as far as the works the Lord Jesus Christ did here on earth. So, your understanding of the word “greater than I” is as inferiority of person or nature.
Now, If the disciples will do “greater” works than the Lord Jesus Christ in John 14:12, then they are more superior or “greater” than Him and therefore there is no equality between the Lord Jesus Christ’s works while He was here on earth and His disciples’ works.
“Greater than I” in the context of John 14:28 is not like inferiority of person or nature or rank, because in essence or quality the “Lord Jesus Christ and the Father” as suggested in John 10:30 “are one” in essence.
And “greater works than” in John 14:12 is not like inferiority of works because the essence or quality of all the works that the Lord Jesus Christ did, while in the flesh –John 1:14, here on earth and His disciples’ all equally came from the same Father/God.
The quality or essence in the Triune God is the same or equal with each other as John 10:30 suggested “I and the Father are one” otherwise there will be conflict in the Triune God if one is greater than the other as in one is inferior than the other. IOW, if God/Father is saying something then the God/Son cannot say it differently from what the God/Father was saying.
JN 5:19 Therefore Jesus answered and was saying to them, “Truly, truly, I say to you, the Son can do nothing of Himself, unless
it is something He sees the Father doing; for whatever the Father does, these things the Son also does in like manner.