"at impact the shoulders are parallel to the target line"
re-watch the video
he says by impact there is considerable separation between the hips and shoulders. he then draws a line on the shoulders WAY BEFORE IMPACT and talks about square shoulders. does Kostis teach square shoulders at impact? I dont know and i dont care. I dont get why people on this forum take such pride in pointing out and degrading other instructors just because they teach different things than Manzella does.
There are many different ways to swing. Some are better off with open shoulders at impact, some are better off with the shoulders more square at impact. If I recall correctly, the drawings from 5 lessons clearly show that Hogan thought the shoulders were square at impact(I am referring to the schematic of the hips vs shoulders with ovals).
The constant breaking down of other instructors just shows how insecure some people here are about the instruction they are following. If you really buy into what your instructor is selling, then it shouldn't bother you so much what other pros are saying.