You seem to have a bee in your bonnet about weight, which in this case is irrelevant. From all of the (admittedly limited) information that we have the aircraft took off and climbed successfully so weight was NOT the cause.
There is no evidence available to us to suggest that the aircraft was not operated within its limits, nor is there any evidence to suggest that anyone (including the pilot) did anything which contributed to the accident.
The pilot was highly experienced and was known for his carefull safety attitude.
The evidence suggests an engine failure, possibly including an engine fire, shortly after takeoff. The causes of this failure are subject to investigation and would almost certainly be of a complex technical nature.
Please stop speculating and wait for the official report, it can often take over a year for a complex investigation to be completed especially in cases where the engine and possibly other items have to be shipped to the manufacturer for investigation. If there were any safety related information available it would have been released as an interim report suggesting any actions to prevent a recurrance.
Any comments which might infer blame are at best unhelpfull and contrary to the fundamental principle that everyone is innocent until proven guilty.