I think they just believed that with Biden on the ticket, Trump's ineptitude would be overshadowed by Biden's ill health (at the time, at least). Biden dropping out and Harris stepping in destroyed their plan. But to be honest, it was never a good plan to begin with.

Absolutely and spot on, Brian. Trump's entire campaign strategy was "Joe is old!". And then Biden said "You know what? I AM too old for this shit! Here, run against your worst nightmare instead!" Yam Tits was even bitching about not running against Joe during the debate last night! 😹 He's got nada!