Hitler was a creature of the German High Command as well and resuscitated the party which it had controlled throughout the war transforming it into the Nazi party. So the two things you claim could have been avoided: the USSR and Hitler were both products of the German Army.
Your scenario is possible but not to me very likely given the nature of the German Army and the Kaiser. It would have been only a matter of time before the German power would have recovered and gone back on the attack. And the Soviet Union would have been an ally.
Germany sent Lenin in the hopes that he would get Russia out of the war. There is no way Germany would have allowed the Soviet Union to survive after the war. Most of the European territory that became the USSR was handed to them at Versailles. As for Hitler, the German high command sent him to spy and report on the NSDAP, not to revive it. And they wouldn’t have needed to do that if Germany hadn’t lost the war.
“Germany was under the control of the Kaiser who was practically certifiable.”
That is ridiculous.
“The creation of the Soviet Union was more the fault of Germany than any other nation.”
The creation of the Soviet Union was the fault of the Russian nobility who refused to grant some basic rights to their citizens; while the Germans aided the revolution, Americans saved Stalin 20 years later from destruction so must be credited with preserving the Bolshevik Revolution.
The Kaiser was the figure-head. The German High Command ruled Germany in WWI. I can give you a list of which German generals were the dictators during that war if you want.