Good question. Who knows? This all is a rather fantastic "what if" and I don't think any of us can have anything more than an opinion. I don't know what facts you could use to support any of this.

It is my opinion that were this to have occured it would have been a "no holds barred" bloodbath, which is saying quite a bit considering what had already occured. Everyone was tired of war and would have looked to what they thought was the quickest way to end it. If the West struck first, I think Stalin would have used chemicals as now he truly was alone and survival would have been his only hope. If Stalin struck first, what compunction would the US have to not use nukes? Even POWs would have likely been seen as collateral damage in this scenario.

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"I do not have to tell you who won the war. You know, the artillery did." - Gen. George S. Patton
"In 9 months and 3 days of combat on the Continent the 949th FA Bn had fired 51,000 rounds of ammunition, approximately 2,550 tons." - Unit History