– “WTC 7 couldn’t have been rigged in a few hours.”
The sort of pre-rigging you’re suggesting is also implausible for another, more mundane reason. Pre-rigging for a typical civilian controlled demolition involves pre-weakening structural members with disc cutters, and boring holes ready to take explosive charges. If I’d have worked in WTC7 I think I’d have been pretty suspicious if gashes and holes had started accumulating all over the building, especially if the building had suddenly collapsed subsequently, so unless you know of such reports from staff I think we should conclude that any such work was done after WTC7 was evacuated on 9/11.
Don’t get so focussed on structural engineering that you lose sight of the bigger picture.