Rightly explained by you but i have problem with the red part ..........we are diversifying too much on the SRSAM area
In my opinion we should have common missile say of 20 km and a ER version of it (let's say AKASH NG) ........and diversify for IN, IAF IA
for QRSAM = AKASH NG upto 20 km
for SRSAM = AKASH NG ER for 20-50 km
Now it should be capable to neutralize low level supersonic missiles so that it can adapted for all tri-services
(especially for IN where combination can be QRSAM, BARAK 8. VLRSAM to give point to area defence )