I've always thought 2 Corinithians 2:5-7 was interesting in this regard: "Now if anyone has caused sadness, he has saddened, not me, but all of YOU to an extent—not to be too harsh in what I say. 6 This rebuke given by the majority is sufficient for such a man, 7 so that, on the contrary now, YOU should kindly forgive and comfort [him], that somehow such a man may not be swallowed up by his being overly sad."
The JW's use this as a "reinstatement" example. Paul had earlier written about a man that needed to be "disfellowshipped", and here he is now "reinstating" him.
Note, though that the "rebuke" was only given by the "majority". Did some minority of the congregation not participate in shunning this man? How else could this verse be understood? If so, why wasn't that minority disfellowshipped, as they would be today?
In addition, in all of these verses, the word "unrepentant" doesn't come up. "Stop mixing in company with anyone called a brother that IS a fornicator, IS an adulterer, etc". It's always about what the person is doing, not about what they WERE doing. And of course, there is absolutely no reference to any sort of judicial arrangement or announcement to officially designate people as "disfellowshipped" or "reinstated".
Their allegedly scriptural position just doesn't stand up to scrutiny. The verses they use make much more sense when viewed as advice, to be taken or not, by individual members of the congregation. Instead of a Talmudic law to be followed or face retribution.
BTW, in poking about at the Watchtower site just now, I found this little gem: "By also avoiding persons who have deliberately disassociated themselves, Christians are protected from possible critical, unappreciative, or even apostate views. — Hebrews 12:15, 16."
JW's are so fragile that they need to be protected from "critical" and even "unappreciative" views! Poor little spiritual waifs! *gag*
Dave