Joey you have made a few assumptions and ask Us to go and look through the various discussions in regards to supersonic and subsonic missiles. I have done a little research before coming here, to the table. you have however brought up a few points that i would like to cover in the next post as this one will look absolutely huge other wise.
And I have puted up sources as well, Simply put the navy has done its research more than you I will ever and i have given its sources as well, And they are not naive to think of that they have gone with for supersonic over subsonic missile (kindly check the link I gave you), Nor I want to put up detailed presentations of things. The brahmos is far from just Yakhont.