I don't short or ever plan to and I think I have made my opinion very clear on the matter. I don't expect to even see much of a short squeeze as I don't believe people would short short ~30% of the float without a plan to get out. I could be wrong, I'm not an expert, that's just my opinion.
That being said I want to touch on #4. Again, not an expert. This assumes that the shorts are forced by the broker to cover the shares. I don't believe this is a very common occurrence as most short positions are covered before that happens. If warrant holders are indeed shorting they have all the time in the world to wait it out. They get to buy at a set price no matter what. This is still, IMO, the only logical explanation for almost 5M shares being short. I guess we will find out later how all this plays out.