Investigators typically will want to x-ray examine the fuel controls before bench testing. This should confirm if metering valves are stuck in an unexpected position.
After bench testing we could know a lot more
Of course we haven't seen any reports about the condition of the engines, as found, that confirm the level of power
Obviously things don't add up or we would have heard a lot more
I've heard nothing about the condition of the DFDR being melted. Yes it's pretty hard to do in your typical prang and ground pool fire. Mostly because it gets ejected to ground level where temperatures are cooler. I'm not sure where this one was found in this accident.
still not enough info to even speculate about