M63...
You apply a certain amount of power, since the time taken to accelerate a jet engine from idle is not only significant, but varies between engines... Once you have the engines "stable" at a mid power setting, it takes far less time, and less variable between engines, to takeoff power...
In practice, this means if you just pushed the throttles forward form idle, one may well start producing significant thrust well before the other, and the aircraft turn - all rather embarrassing
Without causing extensive and unnecessary speculation, my info seems to indicate that all MAD runways now open, whereas in the hours after the accident, one or even 2 (?) runways were closed. If significant debris were left on a runway (the takeoff runway of the affected aircraft?) maybe one would expect that runway left closed for accident investigation purposes and debris recovery in slow(ish) time?
NoD