I would caution drawing any significant conclusions from many of the reports, since many are translations from one language to another or perhaps more. Much meaning can be lost in the process.
If the take-off was rejected, there would be assymetric thrust reverse on the operative side, which would create a tendancy for the aircraft to veer right if the left engine was inoperative.
How did the fire services respond, and were they able to reach the stricken aircraft? In the case of fire, seconds are vital to the survivability of any accident.
A great tragedy, much sympathy to those involved and their comrades.