Highly unlikely. A big part of the reason the USSR had such a huge apparatus of commissars was to ensure control of the military by the civilian government. Even if Stalin dies in a freak accident Zhukov's too far removed from any possibility of power, plus the existing figures in the Politburo, for him to take power.
The only real possibility is if Beria makes a grab for power and things go south from there but that's highly unlikely. Beria was the first (and only) one to go up against the wall after Stalin's death because everyone else was convinced he was too dangerous to leave alive.