Sunnah method of dua after Salaah

Q: In our area, the Imam starts to make dua with such a voice that muqtadi could know that Imam has started to making dua and all the muqtadis start making dua after listening to the voice of Imam (e.g. if he starts dua with alhamdulillahi rabbil a'alameen, he says alhamdulillahi...... with voice and then make entire dua silently). He ends the dua with voice so that muqtadis could know, and muqtadis also end their dua after listening to his voice. No one starts making dua before and none completes dua before the Imam. What is the shar'ee status of this all described above? Should the muqtadi not start making dua before the Imam? Should the Imam inform the muqtadees about his dua by starting it with voice or he should starts his dua silently? If one has finished his dua before Imam, should he wait until the Imam finishes or one should he stand up to offer the sunnats (if there are sunnats after that fardh salaah)? Please clarify the questions and the Shar'ee status of the custom of dua described above.

Dream

Q: Today I saw that I was in my grandfathers house and me and my brother were sitting with him in lawn. He had passed away 7 years ago and he said that he is dying. I started panicking and then he died. I went inside to tell everyone and I saw that my deceased grandmother and uncle were also sitting in room. I told them that grandfather is not feeling good but nobody seemed to notice then my cousin came in carrying my grandfather inside and he looked so weak in the dream. What does it mean?