I still think he has a special role ... maybe he is going to tell ran that conan is that actor's son
so we will eventually benefit of him
That is true—Shinichi/Conan had to stop him from telling Eri and Ran that Yukiko is his mother, once (Files 264–266/Episodes 199–200 – Murderer, Kogoro Mouri).
“Life is infinitely stranger than anything which the mind of man could invent. We would not dare to conceive the things which are really mere commonplaces of existence. If we could fly out of that window hand in hand, hover over this great city, gently remove the roofs, and and peep in at the queer things which are going on, the strange coincidences, the plannings, the cross-purposes, the wonderful chains of events, working through generations, and leading to the most outre results, it would make all fiction with its conventionalities and foreseen conclusions most stale and unprofitable.”
“Education never ends... it is a series of lessons, with the greatest for the last.”
― Arthur Conan Doyle, The Complete Adventures of Sherlock Holmes and His Last Bow
"I have decided to stick to love... hate is too great a burden to bear."
— Martin Luther King Jr. (A Testament of Hope: The Essential Writings and Speeches of Martin Luther King, Jr)