Yeah, I mean that was during the time of the ascendancy of his ershwhile political enemy from Bengal, Khawaja Nazmuddin...(who was also Bengali) so again, WTF does that have to do with as you say "West Pakistani elite"?
West pakistani bureaucracy, feudal lords, and military dominated pakistani politics right from its inception that should not be news to someone who has even a cursory knowledge of its affairs .Nor do the PM in Pakistan except the quasi fascist z a Bhutto and 2nd term Sharif ever had the ultimate power in politics.
Regarding bengali politicians in earlier years they were represented as figurehead but only lasted as long as they kept the establishment happy, and many of them opted to stay in west Pakistan even after Bangladesh was formed just shows how much support they had on the ground e.g noor ul amin another PM from bengal