I'm absolutely uncertain as to how much utility can be had by making your or the opponent's jumped piece "transparent" -- you could definitely be correct, but I suspect that you could get some nasty forks set up by using it.

I also don't really feel like its moveset nor its ability really fit the name reaper. To me reaper sounds more like the grim reaper or death in which case it wouldn't make units see through, nor would it a unit next to it to kill.

Oh, so you think you know how the Grim Reaper operates, do you?!?

No, just kidding. I agree.