Heart attack at 39... Wtf... I suppose it's possible that you subconsciously picked up some irregularity about the people you knew, and the dreams could be more pattern recognition than prophesy. Idk, just thinking. Then again, maybe the difference is meaningless - proven track record... Did you know about the flood in the town before the dream? How bout this - the man did die in the flood in 2020, in that it changed who he is now. What kind of change would be equivalent to death? Maybe hopelessness, maybe nihilism, maybe loss of some belief, maybe somehow it cost him some love that was what gave him meaning... If the building changed in each iteration of the dream, that could represent the variability of time after that definitive moment. Try this - see if you can query the message via another dream or meditation or tarot, and ask what would cause a resurrection in him. Or something like that...