Really good, but the last point kind've annoys me, as does number 7. Model's forces were withdrawn and sent to Italy after the Sicily invasion. The "insignificant landing by a couple of British and American Divisions" caused the Italian government to fold, leaving the southern German and Austrian borders open to Allied assault from the air and ground, not to mention by Italian partisans.
As for the Germans never being able to win at Kursk, the German 24th Panzer Armee was never committed, being held in reserve by Manstein and ultimately not allowed to participate in the battle by Hitler. At the time of the ridiculously one-sided slaughter of Prokhorovka, there was nothing behind the 7th Tank Guards army. The 3rd and 4th Tank armies were over a hundred miles away, and the ground between the Psel and Kursk was the perfect tank country that Manstein was craving. Had the Panzers of the 24th Panzer Armee been unleashed, History might be very different right now.