First clear one thing, whom do you want to call VYAKT OR Sakar?
Again you wrote.1)Yes, even in vyakt BapDada is supporting BKs through vyakt body of Gulzar Dadi, may be few times per year.
You are not getting your self that what do you want to say.the following Avyakt Murli point syas- the word Sakar is used for soul of Brahma Baba even after 1969.:-
Now For your kind information that Baapdada is Always Avyakt, never can say VYAKT BAAPDADA as you wrote above. Because you can not see that part through these physical eyes, You can see that part only through the GYAAN CHAKSHU OR KNOWLEDGEABLE EYES. And To listen regular mu. Or knowledge in only for to continue our firm belief toward SAKARI part, thats why Baba says MAN MANA BHAV Merge your intellect with my intellect, and listen want i want to say.
For this sakari part Baba told in Avyakt Vani..
Pahle gyaan aata hai fir GYAAN DATA AATA HAI
Mukhya shakti hai PARKHNE KI SHAKTI, Pahle BAAP KO PARKHENGE...,PARAKHNE KI SHAKTI SE TUMNE BAAP KO JANA HAI,
Sakari sharasti par Sakari netro dwara DONO BAAP KO DEKHNA(mean you can see Shiva in prajapita. But you want to say that Dadi is prajapita. Very good.) YAH BRAHMAN JEEVAN KA SARVSHRETA BHAGYA Hai, aisa bhagya poore kalp me prapt nhe hoga.
Baap is samay HAZIR NAZIR (according to you Dadi is baap, good)HAI,
Above Avyakt Vani are saying that Prajapita baap is in front of our physical eyes but few point says you can see him or recognize him only through the Knowledge or intellect. Same thing is told in BHAGWAD Gita
न तु मां शक्यसे द्रष्टमनेनैव स्वचक्षुषा ।
दिव्यं ददामि ते चक्षुः पश्य मे योगमैश्वरम् ॥
भावार्थ : परन्तु मुझको तू इन अपने प्राकृत नेत्रों द्वारा देखने में निःसंदेह समर्थ नहीं है, इसी से मैं तुझे दिव्य अर्थात अलौकिक चक्षु देता हूँ, इससे तू मेरी ईश्वरीय योग शक्ति को देख॥8
So this thing can neither apply for bindu nor for Dadi Gulzar