Great article! I'll need to go over it again but without coming off as snarky I would add...

The pool that the staker's share in is funded by coins that haven't claimed or cannot e.g. Mt. Gox trustee, satoshi's et al.

Stakers are receiving a dividend at the completion of a staked period of Hex but this dividend would not be considered interest, as you mention in the article but a yield. Which is dependent on the staked period and the compounding accumulative effect of each minimum staking period which checking now, since I don't know is.... 7 days....

I forgot where I was going with this but your post was great.