There is quite a bit of information to digest the Morningstar paper. I think I will need my highliter and pencil when I read this one. There will be lots of notes!
I don't know about that Morningstar RMD approach. It would bounce you up and down dramatically with fluctuations in portfolio value and (other things being equal) would have you spend greater and greater amounts as you age. I assume the probability of failure approach would have the same results since the RMD method tries to vaguely simulate it.