If that is true (it's not) then being the only man to live a sinless life is meaningless and not an accomplishment in the slightest yet the writers of the NT give great praise to such an accomplishment because it is impossible for regular people. This means he could have sinned but chose not to which is self control on a Godly level.
But doesn't this which you are saying deny that Jesus is God the Son? I am not dictating what you have to believe, but do you believe in the Trinity meaning three Persons of God?
I offer that if God came as Jesus and did not sin because He can not sin, this does mean something.
It means God even in human form can easily keep from doing evil (James 3:13). And it means that Jesus living and growing in us as our new inner Person (Galatians 4:19) is easily, almightily, able to keep us from sinning and in other ways being under the power of Satan (please feed on Acts 26:18). And Jesus shares this with us (Galatians 2:20) as much as each of us is "one spirit with Him." (in 1 Corinthians 6:17).
"You are of God, little children, and have overcome them, because He who is in you is greater than he who is in the world." (1 John 4:4)
So, if Jesus can not sin because He is God, this means He is so much greater in us (Galatians 2:20, Galatians 4:19), than one who could sin would be greater.
So, it makes a big difference, also including that if Jesus can not sin, then Jesus growing in us makes us more and more easily able to stay clear of sinning and giving in to Satanic emotions and feelings and drives, and it becomes less and less of a struggle, since Christ's power is almighty with God's own immunity to sin-sick stuff; God in us shares His very own with us, including like this . . . more and more with His correction and how He has us growing in His grace which is almighty in our character. But if Jesus in us were a being inferior who is capable of sinning, this could mean we never stop struggling, but in His love with almighty immunity we can snuggle > 1 John 4:17
Also, it makes a major difference because it means God sent us a Person of His own self, and not some lesser being to reach us. And this is how love is > love will give the very best.
And I will offer . . . about how much it would mean for a human of one's own will to choose not to sin >
"it is God who works in you both to will and to do for His good pleasure." (in Philippians 2:13)
So, from this, I trust, God is not interested in how we can get our own selves to make choices, because it would be in our human ability and spirit which would not be pleasing to God our Heavenly Father the way His own Son is so pleasing. So, He desires to work in our wills "for His good pleasure" how Jesus is pleasing to Him.
And this brings another item > a lesser being than God could not please our Father, on the cross, like Jesus has pleased Him as "a sweet-smelling aroma" (in Ephesians 5:2) > please see and consider Ephesians 5:2. A lesser being capable of sinning could not please our Father to reconcile with us and forgive us, like His own and divine Son has satisfied Him (1 John 2:2).