rananim:
I've been in the cockpit flying the mighty 9 (earlier version...dc9)...just sitting at the gate reviewing takeoff info.
Checking what we call the rat / epr gauge/display, the takeoff epr was very very low.
this can't be...something doesn't make sense.
so, we looked around...called mx, and a wise old mechanic came out...said:
the plane thinks its in the air and the RAT probe is being heated on the ground when it shouldn't be. so the rat probe thinks the temperature for takeoff is about 50 degrees C. (much warmer than the 20c actual).
he showed us a circuit breaker (can't remember where) that had popped, reset it and a few seconds later the RAT probe cooled down and showed a normal epr for takeoff.
the other things you mention may or may not be present...but at slow speeds, the anti skid doesn't matter on the douglas etc.
I think those in charge of the investigation must be considering this scenario...or something close to it.