I say that he never did die, even though the novel says so, but that he severed his connection with the force; hence the force blast that occurred. By doing so his presence in the force would not be possible to detect (Yuuzhan Vong ring any bells) which is why the two dark lords thought he was dead.
Sh‚sotjontŻ ch‚tsatul nu tyŻk.
TyŻkjontŻ ch‚tsatul nu midwan.
MidwanjontŻ ch‚tsatul nu asha.
AshajontŻ kotswinot itsu nuyak.
Wonoksh Qy‚sik nun.