The Mishnah in Bava Kamma 59a tells us that if Reuven sent a חרש שוטה וקטן to do a destructive act he'd be
"פטור בדיני אדם וחייב בדיני שמים"
exempt in a human court, but liable in the court of Heaven.
However if Reuven sent Shimon to do a destructive act (and Shimon is a competent person), Shimon would be chayav.
The Gemara in Kiddushin 42b references this Mishnah and asks "שלוחו של אדם כמותו" ! Then answers
"שאני התם דאין שליח לדבר עבירה דאמרינן דברי הרב ודברי תלמיד דברי מי שומעים"
ie a person's agent is like himself doesnt apply for an aveirah, because when there is a conflict between the words of Hashem vs human being, we should obviously follow divrei Hashem
My question is: I get that the Shimon is chayav for the action for the reason mentioned above- but is Reuven off the hook completely scott-free? Would he possibly get a "פטור בדיני אדם וחייב בדיני שמים" in this case as well, even though it's not a חרש שוטה וקטן? Or some other form of penalty/ punishment?
(ex: In American law, if someone enlisted a murder-for-hire person both would be punished- not just the one who committed the action)