Well, let's extend your logic - a couple of verses later (v.17), when Jesus said
"you know him, for he dwells with you, and will be in you",
he was only referring to the disciples.
Why was it only to the disciples that Jesus said, "If you love me, you will keep my commandments" (John 14:25)?
If they were already saved, why did Jesus say to them, "If you love me, you will keep my commandments" (John 14:25)?
We are MADE Righteous. We are not righteous. We can do nothing to be righteous. No law keeping can make us righteous. Jesus righteousness substitutes our sinfulness.
THE JUST FOR THE UNJUST, 1 Peter 3:18 KJV.
If we love Jesus, we are given the Spirit of Christ, which MAKES us righteous, thereby we keep His commandments - by grace (free gift), we are saved.
We are given the righteousness of Christ to put on, that is to believe we have receive God’s blessing of righteousness in Jesus. The gospel is about believing what God Has already done in Jesus. Not working to get God to accept us.
Our work is to believe. Believe the gospel, which is the power of God unto salvation, Romans 1:16 KJV.
The POWER of God. Not our power. We cannot insult God by doing works or trying to keep the law, when God said all our righteousnesses are as filthy rags, Isaiah 64:6 KJV. We must put on Christ righteousness: the Spirit of Christ, the new man by the Spirit - the Spirit is our wedding garment.
Substitution -
God took our carnal man (sinful nature, our self man, our pride), and put it away for ever crucifying it on the cross with Christ. So we are dead in Christ. Then God raised us up in Christ and gave us His Spirit that is Holy and because we have God’s Holy Spirit - God’s Spirit cannot commit sin, therefore because we are dead in Christ and no longer have sin, we are MADE righteous in Christ. This is the new man (born again).
We must get this understanding because if we don’t, God will not accept us. God only accepts His Son. Not us, that’s why He crucified us on the cross with Christ, Romans 6:6 KJV, to put away the old man, to destroy sin.
The man at the wedding feast did not have on a wedding garment, Matthew 22:11-13 KJV. He did not put on his beautiful garment, Isaiah 52:1 KJV. Again, the wedding garment is the Holy Spirit.