And political leaders have any power or influence in the say of matters over Army Generals? As for ZAB not accepting Mujib's victory, it was all politics and also the (pseudo-)'superiority' of West Pakistanis over Easterners!
Btw, Yahya Khan was the dictator. The onus of accepting election results was on him, not ZAB. He could have turned the tide, but instead chose to attack India and the rest is history. Yeah, blame toothless politicians when real incompetence lies with your 'beloved, never wrong' Army/Establishment.