The RVs had a twin cone design, not the nose cone/MIRV shroud of the Polaris missile. Here is an illustration:
What I'm trying to say all along and want everyone to understand, is that Shaheen-3 has a smaller RV (the upper half of nose cone) and therefore a smaller warhead. Obviously yield hasn't been compromised, it must be the same as Shaheen-2, otherwise the strategic value of the device will be questioned. This implies that the older U-235 based device has been replaced by a U-235/Pu hybrid or only Pu-based implosion device. Which further means that the RV has been miniaturized enough for an MIRV bus to carry and deliver.
All of this implies that the new RV (of Shaheen-3) is small enough (~70cm at base) to be used in multiple numbers, aboard a larger payload delivering vehicle. So a new missile/variant has to be developed which can deliver 1500-2000 kg payload, with an MIRV bus wide . Trust me, when Pakistan tests a MIRV-capable system and shows its images, we'll know for sure that it is MIRV-capable.
I agree, in space, attitude changes can be made by the current systems. But you have to consider that fuel for thrusters
is quite limited (in case of Shaheen-2), but perhaps not for Shaheen-3, as I said earlier about the possibility of a large hydrazine motor in the lower part of the Shaheen-3 nose cone. This evading maneuver can only work for mid-course interceptors, not terminal ones.
No, thats where most people are wrong. The speed of RVs inside atmosphere is drastically reduced, and the impact is usually around Mach 4-5. So the time is a longer than 20 seconds.
Wrong again, ABM radar continuously track ballistic objects from the moment they detect them (usually in the boost phase in case of Indo-Pak). BMDs are fast enough, there shouldn't be any doubt about their reaction times.
Yes, decoys are where we can effectively fool the ABM and simply over-power its capacity.