Ahhhh, ok, yes I wasn't entirely getting what you were saying there before! But agreed on how you've stated it above.

I think that's part of the trouble with the principles of TDT. King has outlined certain concepts at the start (and in linked books) that he changes his mind about in the latter books, so we're trying to theorize off something that is being viewed different ways by the author even before we add our understanding of it.

I'm sure Parkus says something in Black House about Roland being the last of his line too, it may just be that he's the last gunslinger. However, I was thinking about your multiple Rolands theory this morning and wanted to ask, what do you suppose then happens to each Roland as they reach the top of the Tower and the loop starts again? Because it seems to me that the loop is a lesson/punishment, but if each Roland is then left as Gan jumps to the next one, he's not really stuck in a loop at all.