Did Dumbledore plan on showing Harry how to destroy horcruxes the night he died?
One thing that seems to piss of Harry (and Ron) a lot is that Dumbledore didn't tell them how to destroy horcruxes which is honestly valid there was no reason to make that one more thing for them to figure out. So that got me thinking, did he plan on explaining all that when he destroyed the locket with the sword once they were back from the cave? Which would also mean that he in fact had no idea that night was the one when Malfoy struck?