Just read those two reports.
The first one has zero bearing on the IMCR. It appears to have been an engine failure together with the pilot being for some reason unable to maintain stability during the descent, with the failure perhaps being masked for a while by the autopilot being in use. And the engine was knackered, with zero oil analysis being done (IMHO not even the oil filter was ever cut open to check for chips - just like in a more recent fatal accident where the camshaft was found to be knackered just like this one).
The second one has zero bearing on the IMCR or the IR specifically but the IR holding pilot had what appears to be a low currency: 3hrs in the last 28 days. It appears to have been an engine failure together with the pilot being for some reason unable to maintain stability during the descent.
The amazing thing in the 2nd one is that it identifies the maintenance (mag repair) company by name. Tempting to comment but one would need to be awfully careful....