At first I wondered if all Jedi turned to the dark side would revert back to their Force-loving selves when they die, but that didn't seem to make sense... There could be potentially thousands of them over the millennia.
So then I wondered, why the Inquisitor? Why the second chance to serve in the Temple?
Does this have anything to do with the final choice he made in 'Fire Across the Galaxy' to...
let go of the bridge and not force Kanan to loose the killing stroke on a former Jedi? Does it have something to do with admitting his fear and then submitting himself as a sacrifice instead of continuing to serve the Emperor? Did that final choice redeem him to the Force?