>>51313369But ben's literally been resurrected from death by the omnitrix and trying to cut his arm off has failed before.
The omnitrix cheats harder than the green lantern ring.
the best GL could do is go back in time to kill Ben before he gets the Omnitrix and hope no time-travellers like Ben's future selves or alternate selves or friends like Professor Paradox get in the way.
I haven't seen Death Battle downplay anyone this hard since they pretended SSJ3 halves Goku's power level instead of multiplying it.