Chelsea manager Mourinho led Inter to the Treble four years ago.
Moratti said: "I think it was right to end that way. Mou was like a gust of wind, or a huge thunderstorm. It was right not to drag the rapport on after the Treble. The next season we won the Italian Super Cup, World Club Cup and Coppa Italia.
"If Leonardo had arrived earlier, then perhaps we would've won another Scudetto," mused Moratti.
"Jose did not find satisfaction at Real Madrid, but now he is at Chelsea, another club he is fond of. I know that he'd come back here to Inter. He can't right now, but maybe he'll arrive later on after Walter Mazzarri, who is another very good Coach, has won three Scudetti."
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