MARV was mastered by India in late 1990s early 2000s
Actual Agni 5 missiles are having elliptical dome instead of conical shape. I can't Post real foto as it got deleted by me by mistake. But the real inducted version has elliptical dome. It's for a reason that no new launch videos are available in public domain. All are stock videos...
Now don't tell India is not capable of MIRV technology. ISRO demonstrated it several times with multiple satellite launches with highest being 101 satellites. Technology is exactly the same with a bus holding warheads instead of satellites.
Also you are grossly unaware of India's miniaturisation of nuclear weapons which is almost at par with P5 nations as we got access to French super computers for simulation of modern nuclear weapons design....