I was thinking the same thing! (although I think Taken is missing that IC throughline, esp. towards the end?)
I don’t think I have much to add to @Lakis and @Gregolas’s great responses. However, I will commend you for your very insightful questions. I think you are currently on the steepest part of the learning curve, but soon it will get easier. Separating the throughlines is the hardest part to grasp (and sometimes it gives even the experts trouble)!