The Soviets bore the brunt of the fight against Germany. Roughly two-thirds of German casualties were on the Eastern Front, and the Soviets killed or captured about 9 million Axis soldiers, more than double the entire population of Finland in 1940.
You know you're taking out of the equation the will of the Finns to defend their country. You keep talking as if the Soviets could've done it, if they wanted to.
They didn't do it, and you know why? Because they tried, and couldn't. That's what happened.
I'm sure you mean well, but even though they killed more than 5.5 million Nazis, they couldn't kill more than 70k Finns. And that's history, not some alternative possibility.
https://en.wikipedia.org/wiki/Eastern_Front_(World_War_II)#C...
Edit: What do you think would have happened if they had sent 10m soldiers to Finland instead of 500k?