He-correctly-believed that Italy would collapse quickly if the Allies invaded it. Kesselring's countermoves to seize control of Italy from right under the Italian and Allies' noses is actually one of the more amazing campaigns of the war.
Perhaps because of an unintended edge Mussolini had given the Allies earlier in the war. His army got bogged down conquering Greece
and the Germans had to come to their rescue, delaying their 1941 invasion of The Banged One's ancestral homeland from March until June. This of course exposed the Germans to more of the Russian winter. Il Duce was a better grandsire
than a wartime leader.