Okay, third time around, here's what I've got this time . . .
Holding the power did strange things to my mind. In just a few moments, I became familiar with the power itself, with its history, and with the ways it might be used.
Yet, this knowledge was different from experience, or even ability to use that power. For instance, I knew how to move a planet in the sky. Yet, I didn't know where to place it so that it wouldn't be too close, or too far, from the sun.
We know that whomever this Hero of Ages is, they actually held the power of the Well of Ascension. I'm personally going to chalk this up as more evidence of it being Rashek, because it would explain how he messed up the world so bad. For example, he moved the planet closer to the sun, causing the burnlands and making the regions around the poles habitable. (Possibly so he could survive with a capital city right over the Well of Ascension.)
This also leads into why the mist spirit attacked Elend. (Kinda.) If Vin wouldn't have been in such a hurry to save him, she might have had enough time to spend learning her abilities to guess at Ruin. Is the mist spirit perhaps an agent of Ruin? I mean, the deepness has some connection to Ruin, and the mist spirit is connected to the deepness. (Probably. In some fashion.) It could have been getting Vin to try and act without thinking, and maybe it cut Sazed's manuscript to make him tap his metalminds or something. Just some food for thought.
He could have created a set--he was of the Third Generation, which was old, even for a kandra.
Kandra society is very age based, they can breed offspring somehow, and the First Generation I would assume are the ones The Lord Ruler (Supposedly.) created a thousand years ago. This could be how Kandra religion survived, as there are still Kandra from before The Lord Ruler's reign. (Kind of.)
The next paragraph gives us some more inside info on how Kandra work. They do sound very similar to Mistwraiths, with the only difference I can see is the mental choice to discard all of one skeleton and only use one at a time. Perhaps Mistwraiths are just kandra on "vacation?"
But TenSoon had the Blessing of Presence. His mind would not give in easily.
I take it this is why Kandra believe they are of Preservation? It sounds a lot to me like Preservation gives them certain gifts, which would make sense if The Lord Ruler created them out of Preservation. (I can't articulate things properly today, but you get my drift.)
I'm getting lazy now, so I'll just make a small list of some info.
1. Kandra need to eat.
2. Is the gold on the bucket significant? (And curse Mistborn. I will never again be able to hear about a metal anything without thinking . . . "If these guys were fighting Allomancers, they'd be hosed." Especially Kandra. Oh well.)
3. Apparently, acid is the only way to kill a Kandra. We should sell this secret to the Allomancer's for cash and atium.
4.Why would TenSoon risk such a punishment? Has he sniffed out Ruin? Does he know Vin knows how to control Koloss?