Sort:  

I still don't know how that whole pool thing works. So if people are on here when the pool resets, could they actually drain the entire pool before anyone else gets a chance? How does it work?

afaik the pool does not reset at a specific time. to stay in the metaphor: you can probably more imagine it like a lake where water (rewards) flows in and out all the time.

For the long term I cant really tell but for day to day terms its like STEEM gets distributed via this pool. You kind of need to think that the pool has 703468"liters" (STEEM) currently in it. On the one side it gets filled and on the other it is getting spit out to users. The +5690 is the difference between how much came in and how much out over one day. So for today less out :D

There is no reset in that form. If the pool gets to 0 I assume you still be getting rewards but less untill more gets added than distributed.