1Co 3:4-9 For while one saith, I am of Paul; and another, I am of Apollos; are ye not carnal? (5) Who then is Paul, and who is Apollos, but ministers by whom ye believed, even as the Lord gave to every man? (6) I have planted, Apollos watered; but God gave the increase. (7) So then neither is he that planteth any thing, neither he that watereth; but God that giveth the increase. (8) Now he that planteth and he that watereth are one: and every man shall receive his own reward according to his own labour. (9) For we are labourers together with God: ye are God's husbandry, ye are God's building.
We are guided by these verses not to think of ourselves and our efforts more highly than we ought to think. We are nothing and the fruits of our own imaginations are nothing unless it is God who works in us both to do and to will His good pleasure.
If we witness to a person and he understands the gospel so that He claims faith in the Lord Jesus Christ who has given Eternal Life and forgiveness of sins; such a SOUL is not OUR exclusive fruit. Someone else might have witnessed to him before, thus planting some seed, some radio, some book, some encounter might have led him to less resistance until such a time that GOD Himself led him to you. So it is inappropriate and actually carnality for a man to lay claim that a soul won to the Lord is "his fruit"
Sovereign Grace preachers who believe in predestination know full well that preachers are mere instruments of God and therefore if someone else's labours enter into theirs so that eventually they don't get the credit or attribution as to who really led them to the Lord, then that is just fine and no loss should be felt.
Let us give all glory to God and forget about factions, names, our own housebuilding upon the foundation of Christ, and let God be the judge on the last day.
Amen