You are making it too complicated in my view. Nubuwa is about receiving divine news from God to people, being the channel of God and God gives feedback to humanity about their state. The Quran is different in that it's revealed in a way to apply for all times, but before that, founding Messengers would be succeeded by Nabis who getting updates from God and being channels of news from God which is his feedback to the current state of t he people they are sent to.I am not referring to the type of practical revelation such as what the mother of Musa received.
This is why you never see in the Quran, it say "and upon the Nabi is only"... because the Nubuwa role is more of God's recitation and he decides what to reveal and when. However, the Resali role is something Quran emphasizes on "nothing upon us is there but the clear conveyance" "nothing is upon the Messenger but the clear conveyance".
Also, 5:67 does not make sense to say "if you don't x, then you have not done x", which is a meaningless phrase. Rather, as the hadiths about it point out it was regarding Ali (a), and so the Sunnah contains part of the Resalah as well, and Quran contains Resali aspect as well, but not all of Quran is "clear conveyance" and not all of Sunnah is clear conveyance either. There is subtle hidden teachings therein in the Quran and Sunnah as well.
A Nabi that is not a Rasool, is when scripture is channeled but is not a resali type nor does he have to deliver the clear messages, because they are known to the people and people accept it already. This is very rare situation when people don't dispute and differ after clear proofs but actually follow the successors to the founder. In this case, the person can be a Nabi without being a Rasool. This is in fact, a very ideal state. Being a Rasool as a successor to Musa (a) for example, would mean, people were differing upon clear messages of Musa (a) and disputing the clear proofs he conveyed. An example of this perhaps is Dul-Kifl (a) who revealed about Gog and Magog to a people who already accepted the foundational messages and wanted to elaborate a very hidden concept of a sorcerers and shadow society that worked to undermine Bani-Israel but were in fact an ancient society.
A Rasool that is not a Nabi, is when clear message is delivered and revival, but not scripture revealed. As scripture feedback is almost always helpful, this is a rare occasion to happen before Mohammad (s). More so, God always proves who he wants to be followed in his books, and so it would be very rare in the past. But Talut (a) perhaps is an example of this but there is some hadiths that can be seen Nubuwa went to him as well, so I'm not sure if he is a sure example of this.
Most Rasools before Mohammad (s) were obviously Nabis, as God's words are mysteriously a way to connect people to that person and prove him and updates in time always takes place in help from God.
Most Nabis were obviously Rasools before Mohammad (s) and no Nabis after him, because people tended to dispute and turn away from truth and oppose the clear messages after the founder.
Also you never find once (I would like to be proven wrong if you can) that the Quran says "obey Allah and the Nabi", everywhere it mentions obedience it mentions to "God and the Messenger" or "God" and "Messenger" and Ulul-Amr of course in 4:59. There is a reason for that. In 33:33 even after the wives are emphasized to be women of the Nabi, and that is the emphasis, they are told to obey God and the Messenger.
Why is that? It's because they have to obey what Mohammad (s) says in terms of the clear obligations in Sunnah as well. Not just Quran.
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