I don’t have a problem with using JW figures because I think they are generally reliable. It’s because you cast doubt on Watchtower figures that I pointed out the same inference about the relative growth of JWs compared with other groups can be verified from outside measures even if you disregard Watchtower numbers entirely.
Watchtower aren’t the only ones who inflate their numbers in various ways. Other groups, if anything, are worse than JWs at this. So any genuine comparisons, looking at the limitations on both sides, and not just the JW side, may produce a favourable picture of growth for JWs compared with other groups.
The most extreme example of inflating numbers is the Mormon church because they routinely add all baptisms to their membership total but do not remove inactive members from the total, so they have ended up with millions of phantom members. Even if they lose touch with individuals they still include them as members until they would be 110 years old. In recent years there has been a movement by former Mormons to request and get their names removed from the membership roll, but even so the majority of inactive members don’t go to these lengths and are still counted.
Other churches, I know, keep members on the books for years ‘hoping they’ll come back at some point’ too, even waiving usual membership criteria such as a small annual donation.
On the topic of disfellowshipping you are correct that Christadelphians do not shun as JWs, but it would be inaccurate to say that disfellowshipping has no social consequences for Christadelphians beyond the breaking of bread meeting, and practice varies between ecclesias with some being stricter than others. In some cases fellowship is withdrawn from entire ecclesias and, while they don’t practice hard shunning, it is fair to say that social contact is curtailed in such circumstances. As for the Exclusive Brethren, I don’t know if they have truly reformed in recent years, but traditionally their shunning practices were every bit as severe as JWs. There are testimonies from former members to this effect.
I suspect that the leaders at Warwick are probably quite alarmed by the figures in the latest report. They are probably inclined to compare it with past performance and see a dramatic downturn. I don’t think they would be much comforted by my point that other religions are doing much worse, because they don’t see themselves as comparable to other religions.
If I was in their position, I would be most concerned about the drop in baptisms because lack of new members will impact overall numbers for years to come. Young people who didn’t get baptised during the pandemic may end up never getting baptised and will be lost forever as members. No wonder there has been emphasis on getting baptised and this will likely increase in view of the latest numbers.
I hope the don’t find the numbers this year so bad that they stop publishing them next year.