The answers are from what I know about penny arbs are:
1. No
2. No
3. No
4. No, these guys are hoping for a penny stock to trade down to nothing, tax free profits & they never need to cover.
These guys will be shorting because they know the stock will drop as the ATM funds are released & the share count increases. These guys are not looking at a day to day price swing, again they have been likely shorting for weeks. The answer to the ihuber posting he made funds on the short side are unlikely. I work with hedge funds & it can be hard for our funds to short certain otc/pink stocks.
A stock like BFLX, I would just walk away from it, again it will more than likely be trading below a penny in the coming months.
BFLX could still likely have a bounce, but it will not be because the shorts are covering.