Unless it's an ending diagonal, these are nested sub-waves with all that overlap, and we have completed (I)-(II), I-II, 1-2, with a huge downside to go to finish 3-4, III-IV, (III)-(IV)- (V). That is IF it wasn't a triangle B in which case we have a I-II so far. There are other count possibilities too, but these wave targets are just unlikely. I do agree with where your wave 5 may end up at... I just think there are many other ways it can get there without taking a megaphone path.