Apostate prophet sees more reasons to piecemeal revelations; supporting the believers?

In answer to the video "Who (Really) Wrote The Quran?"

Besides this gradual educative purpose of the piecemeal system of revelation, the "strengthening of the hearts" also refers to the constant good tidings to the obedient servants in the midst of daily persecution and obstacles.

The numerous prophecies and promises of success in both lives to the patient served this purpose. They were assured of ultimate success time and again to fill them with hope to carry on their mission

16:102"that it may establish those who believe and as a guidance and good news for those who submit".

This mission was to create a movement of faith and righteousness to combat disbelief and sin. The piecemeal revelation guided that movement in all its stages to suit its requirements on different occasions. It did so for example by elaborating on certain previous concise statements, either by a longer revelation in a different place or by addition of relevant information within the same previously revealed verse. We have classical examples reported in the hadith books, like 2:187 and 4:95 where the scribe present, who was being dictated the concise then more elaborate revelation, describes how the event occured supernaturally. It is a Quranic principle that one should not ask about things that if answered would render a simple directive complicated. But one may ask while revelation is descending and will be answered 5:101 as documented regarding ibn Um Maktum's concern upon hearing verse 4:95. The difference between the 2 attitudes is that of sincerity. The first one hears a directive, reflects on it and comes back after a while with conjecture, as if he is trying to avoid it. On the other hand the one expressing a concern directly when hearing a command does so out of genuine concern for a condition preventing him from immediately implementing the directive. 

The gradual revelation, progressive elaboration also gives the audience the feeling that it is being closely followed, listened to, attended to and corrected by its Sustainer, answering relevant questions of law or theology, questions by the believers or disbelievers alike, providing strong argument in favor of the truths it propounds or to counter false notions

25:32"And they do not bring to you an example except that We brought to you the truth and best of explanation".

Again this is not a strange phenomenon in the prophetic history, especially when it comes to the issue of further elaboration/explanation of a previous concise statement or ruling. See Jn3 for example.

17:106 also explains the important point that, despite this gradual system, the Quran is nevertheless one integral whole and can therefore, be properly understood only if it is considered in its entirety, if each of its passages is read in the light of all the other passages it contains.