Only thing leading Biden is Harris and Clintons handlers.
I learned long ago to mistrust self-proclaimed experts and have always been willing to ask the dumbest of questions in a room, because nobody else was willing and in a bureaucracy, everyone else is pretending to be in the know and nodding heads.
My view of Biden/Trump is both are suffering from some decline in cognitive ability(science fact), but Biden is clearly in a far worse condition and he probably mixes the worst aspects of Stubbornness with that weird factor pensioners have in falling for scams and nothing exists that is more dubious than much of modern political theory (Climate Change, Green policies can create a revolution without enormous subsidies, magic money trees, identity politics and the modern race bating industry).
Biden would be the frailest, weakest, gullible and most stubborn President in my lifetime and with his promise of no more wars, predicted defence cuts due to the economics and I'm sure Putin/EU/China will be happy with him in the White House.