I think it was a combination of full flaps and 2 engs.

2 engs with 40% flaps may have been okay..of 3 engs with full flaps was okay.

But somehow six people (3 pilots and 3 chiefs?) missed full flaps and only 2 engs with full power.

I flew my six month PC check this week and the instructor failed the left eng and set the right on fire. The FO wanted to shut the right eng down. That led to the discussion of this c5 crash. Sometime smart people do crazy things and if you just follow along, it could end badly.