Thumpalumpacus
Major
knocking out a major player in the war????
"Major" in what sense? Where do you envision the Italians fighting the Germans?
Much easier to get at France than Italy, from the German perspective. It also concentrates one's efforts against the most powerful army threat it faces. Germans getting bogged down in Italy while the French have 100 divisions right across the Rhine?
I don't think the Germans were that stupid. Relying on one's enemy to to do as you wish is no way to run a railroad -- or prosecute a war.