I think he could have had we not succeeded in out 1st attempt at Normandy. Yes, Stalin had been pressuring us to open another front in addition to taking Italy. But had we failed on our 1st attempt, we certainly would have made another. Or maybe just have slogged up France from Marseille. Either way, Hitler would have had to keep a strong enough presence in Northern France to deny us a 2nd time, and I don't think he was in a position to divert more forces to the losing battle he was fighting on the Eastern Front. And yes, Stalin could have made a separate peace, but that peace would have included Hitler's dead body, punishing Germany and occupying all of it had we not gotten there at the same time. If we're turned back at Normandy and end up later still slogging through France from the West or South at the same time Stalin is annihilating Germany. Ain't no way Stalin stops short of the destruction of Germany, especially with Hitler still alive. Just like he didn't stop in Manchuria after the Japanese surrendered. "Joseph, you can stop now - Japan has surrendered. Joseph, that's Chinese territory you're taking. Joseph, are you there? Can you here me now?"