I took a look at the Chiams angle. Not for me. Maybe a different Jesus. Vander has a few interesting points. Completely contradicts everything in the Chiams work. So you know somebody here is not on the mark.
I will comment on Vander's work as I see a few things in there of value.
How about this quote. "- Impossible -Matt.24:21 precludes dual fulfillment."
Vander, I didn't see anywhere in there where you explained this. Can I help?
This verse says the 'Tribulation' in question had never happened up until the time that it would, It then would happen and never happen again ....therefore is a one-time-event. ? Is this what you mean?
In this case, the Generation Jesus spoke of could only be His own and therefore the Generation teaching of the WTS is bologna.
Was I on your wavelength?