Threat potential is often more effective than actual activity.
In this case the threat of Italian intervention, is probably just as effective as its actual intervention, and this is true also of the Regia Marina. Someone once said that the Tirpitz did more for the German war effort sitting in port, than the Bismark did sitting at the bottom of the Atlantic, because it tied down substantial Allied naval assets that were needed to make sure it never ventured forth into the Atlantic. This same lesson can apply to the RM in the Mediteranean, where just by existing it holds down a fleet nearly twice its size that can not be sent to the Pacific theater.
In this case the threat of Italian intervention, is probably just as effective as its actual intervention, and this is true also of the Regia Marina. Someone once said that the Tirpitz did more for the German war effort sitting in port, than the Bismark did sitting at the bottom of the Atlantic, because it tied down substantial Allied naval assets that were needed to make sure it never ventured forth into the Atlantic. This same lesson can apply to the RM in the Mediteranean, where just by existing it holds down a fleet nearly twice its size that can not be sent to the Pacific theater.