The only way to get an explosive to manage #4 is either (a) an explosive so large as to rip the plane in half or (b) an explosive that was targeted to do just that--stop the recorders.
or (c) just by incidence bomb was placed near the signal cables link to FDR/CVR and cut them when exploded.
PS: It was list of known facts, some of them direct, other (like FDR and explosive traces) from
official sources, not any attempt "to connect dots".