It's so easy to missunderstand and get missunderstood when communication in text with people who don't know you :) This could easily have devolved into a shouting match, but it seems this time we managed to "get the corner" (as in "not fly off the road in a corner") as we say in germany. That slide is pretty good, i hope they listen to you, but if not, you'll be able to show it to them in a year and have a very satisfying "i told you so" monent :D