I doubt Bernie is going to 'drop out' as he said he would regardless of the delegate result.
Biden is melting down, and is getting worse by the day. Think Sanders is waiting.
Biden will eventually reach critical mass to the point where no one can even pretend to ignore it.
Judging from Biden's obvious insanity, I would bet on Sanders coming through in the end.
He has people much smarter than me working for him. I am sure this has crossed their minds.