He might actually feel something in that regard, but it wouldn't be strong enough to tempt him to do anything beyond telling him later on in his adulthood that his father was responsible for the death of his grandfather; if Konohamaru is anyone who holds grudges; but since we already know how Konohamaru is pretty much wearing Naruto's big boots, he would not try to guilt trip Mitsuki to ease his resentment for Orochimaru. He just isn't that dumb to think the 3rd would not have died at Orochmaru's hands or any villain that had qualms with Konoha, he has enough judgement not to drink that poison.