It was an example. I didn´t write down the smallest axis nations and Italy, because they don´t really matter. Italy switched sides (and struggled on teh Balkan and in North Africa) and the other nations were simply too small. For the same reason I didn´t list Brazil, Greece etc. for the Allies.
You forgot Romania, Bulgaria, Finland, Italy, Hungary.
Thing is, the second front was only opened in 1943, and the "real" second front in 1944. By then Germany had lost pretty much all of it's initiative on the eastern front and was on the retreat.
Sure, lend lease DID help, however, you can argue that swedish metal and romanian oil also helped.
Most of germanys casaulties were on the eastern front.
Germans pretty much focused their entire millitary in 1941 on operation barbarossa, and still didin't win.
Without the Allied bombings, the German industry would have produced more equipment to fight the Russians. Those bombings started way before 1943. It bound the forces of the Luftwaffe for home protection - which might have had air superiority versus the Russians otherwise.