Metalrift

I thought that they would try to analyse the honorblade, so that they could use that information to improve the general understanding of fabrial technology. I don't think Dalinar is just going to hand it to anyone he chooses, as it is very important.

That's why I believe the Truthwatcher resonance is involved, as it may allow prediction of future possibilities based on knowledge of the present, which I think is similar to what other kinds of future sight involves. They are seeing into the spiritual realm and using that information to predict the future. However, as I don't know how the surgebinder visions work, I am not entirely sure, but if they use the spiritual realm then the Truthwatcher resonance may help to interpret what they see, thus leading to more powerful visions that "illuminate" the "progression" of the world. Ultimately I just suspect that the Truthwatcher resonance is more powerful visions. I agree that future sight may come from shardic amplification, as could quite easily be the case for Renarin. With regard to the honorblade I don't remember seeing anything indicating that Dalinar gave it to anyone, and he may not feel that he should as it doesn't belong to him anyway.

As we have seen that surgebinders seem to receive visions, specifically Kaladin and Shallan, it could be that the Truthwatcher resonance could be improved visions, like how the Windrunner resonance is improved squires. After all, we don't know what causes the surgebinders' visions or what determines their nature. Your idea makes a great deal of sense for the nature of the Truthwatcher visions.

If I recall correctly, the WoR Ars Arcanum says that it is necessary for lightweaving that the creator must have a spiritual connection image. For Shallan, it is not strange to suggest that her drawings would give her the connection that is required.

I didn't see Renarin as being unhappy at not getting a task, but rather that he is unsure of himself and severely lacking in confidence. He doesn't refuse to learn to use his powers, but he doesn't think he's capable of learning, especially not by himself.