It is unfortunate that DK has not been able to move past the DS years. When I look at the early videos of the two brothers together, I clearly see that DK admired and “keyed off” of MK. However, in things he has said since, I get the idea that he does not have a clear picture of both of their abilities. I think DK views himself as talented as MK. With that as a premise, it is understandable why he has trouble accepting that Mark was so successful and he was not. And adding to the mix, from I think the Palmer book, one of their teachers described DK as a bit spoiled. In DK’s mind with his talent equal to Mark's and being "the cute one”, he probably thinks he should have been at least equally as successful. Niggling in the back of his mind has to be the idea, though, that he blew the opportunity of a lifetime which makes it hard to put to rest. In his defense, though if you watch those old videos carefully, you can see the domineering attitude of the older brother in Mark (i.e. that old Norweigian interview where Mark can't get his cigarette lighter to work and he says to DK "you do it" in a rather commanding way rather than asking nicely as he would have done to anyone but his younger brother!) which must have been hard for DK to accept as they grew older.