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Now its more confused, as M stands for many like Minhas, Masroor, Mushef, MM Alam and etc. and even a new M is coming up in form of Muri.......This might help you understand better :
A squadron to move out from R and shift to M.The squadron moving out of R to be replaced by a squadron from M.The squadron moving out of M to be replaced by Sharp Shooters (I would put M here as well but that would cause too much confusion)
You are correct on many points but not on all.
Dont worry you'll understand everything when official announcements are made.