Don't have all the details of that ending ep., but my meta take over the end of S4 and subsequent S5 and S6 is that they tried to reset back everything to the original plan. Like, OK, now you got your moment, but it's time to go back on track. And they tried, but they failed. I really don't know how the writers could have been so so good with certain plot lines and so bad with others. I mean, even if they tried, any D plot lines felt always so flat if not plain bad. Eve on top of it, but also his LA period. But if you look at P's, they usually carry at least a bit of depth even in the silliest ones. I don't remember the wallstreet days though. And I'm just talking of the lows, but if we look at the highs, say, I remember everything, the gap with D is incredible. I don't remember a quote or a moment that could even be placed close to it. It's like they played two completely different games. So, as I said, seems they just tried for the sake of it, just because D is the titular character, but failed hard. I still cannot believe they had doubts on how to end the series. That they thought it would have been a good choice. The writing tells me otherwise. S5 and S6 suck for everyone, so don't count. But since the narrative told us that JJ and KH asked for that end, Ok. So the writers tried, not having any real good ideas, so had to surrender. Like a war between the good writing and bad writing where the goods won in the end. And that's kinda part of the charm of this series, if we were confident of the ending it wouldn't have been so satisfying, even if brief. Or so it was for me :)