It is interesting to think about the individual cases of the current GB members since they all began partaking of the emblems long after the old "baptized before 1935" doctrine was thrown out. At least one case has been discussed here, that of Mark Sanderson, and I think someone here once mentioned that he or she knew of doubters regarding Geoffrey Jackson. Sanderson's case goes like this. He was raised in during the 1960s and 70s in San Deigo not partaking in his cong at the time. At 18 when he finished high school, he went off to Canada to pioneer. Immediately he began partaking and has ever since. Of course, he got flack for doing so—see here:
https://www.jehovahs-witness.com/topic/6327964561047552/new-khs-still-being-built
The comment by newsheep is not directly on-topic but is provided in the context of a comment on the elder Kelly Flodell. The key description: "t was Kelly who had taken Mark Sanderson aside when he was really really young and told him he better know what he is doing partaking of the emblems. That Mark wasn't even an MS yet and in his late teens partaking of the emblems. Heard this story over and over from Kelly."
I bring this up for the following reason. It is quite likely that each GB member today went through the experience of having various cong members doubt their genuinely "being of the anointed." That this must have been personal and painful is clear. Therefore, they probably don't want to come down hard on others, especially males in the full-time service, who would be experiencing the same thing they went through.
Just some thoughts to share.