Yes, i am sure we are very close on grace, and security..
I just am saying is that some, the minority of the church, in my opinion, Paul did not think they were saved, the majority repented, and were back with paul. But there was a minority left still, those whom he was coming to confront said with strong language. The majority proves there was still a minority.
2 Cor 2:6 For such a one, this punishment by the majority is enough,
The reconciled word with paul is always used as a deciding factor with salvation, so it should be figured likewise in 2 Cor 5:20
20 Therefore, we are ambassadors for Christ, God making his appeal through us. We implore you on behalf of Christ, be reconciled to God.
The verse before shows unreconciled, still have trespasses in their account, as per the unsaved.
19 that is, in Christ God was reconciling the world to himself, not counting their trespasses against them, and entrusting to us the message of reconciliation.
See the usage in these verses also, they are about salvation, clearly showing that the reconciling, is when one is saved, unreconciled people are not, as per Rom 5, they are still enemies, and...these verses show the salvific usage of the reconcile word.
Eph 2:16 and might reconcile us both to God in one body through the cross, thereby killing the hostility.
Col 1:21 And you, who once were alienated and hostile in mind, doing evil deeds, 22 he has now reconciled in his body of flesh by his death, in order to present you holy and blameless and above reproach before him,
Frog.