While the Pontiff is well aware that Germany and England are separate nations, with a separate foreign policy, he is curious what the feelings of the English are towards his proposed security arrangements. He has no intention to generate tension between such staunch allies, but he questions whether Germany's objections are in the English national interest.
The Pontiff does not wish to be confrontational, but he must gently point out it is not possible to take Portugal without the consent of the nation governing Spain, and while the German Chancellor seems to feel that Italy is 'getting the spoils with little effort', I must question how much effort the Germans are truly putting into their seizure of Paris.
Italy feels the offered arraignment gives security to all involved parties, as no combination of forces will be sufficient to make territorial gains without the violation of the proclaimed DMZs. He is willing to add Burgundy to the list of DMZ territories, making land movement completely impossible for Italy in the West, but assumed Germany would balk at this.
If the German and English monarchs would prefer more concrete promises not to violate the territory claimed by England and Germany, Italy is willing to do so - provided reciprocal arraignments are agreed to as well, of course.