Speaking specifically to Sheldon's purchase of warrants, I think "Bullish" is somewhat of a strong word. This could have been done for a variety of reasons we don't know about. As to why this was done sooner than later, this also could have been done for a variety of reasons. The way I see it, Sheldon has no choice at this point but to believe in PTK saving PNP.
Alternately, as to Sheldon not selling his shares......he may not be permitted to at this point given that he remains an insider (if i'm not mistaken). Of course I'm not saying that Sheldon's belief in PTK is unfounded. Clearly, I added some powder to PTK at 1.33$ two days ago so I believe as well. Lets just not get carried away with too much speculation here.
I believe NEWS is coming and soon. Until then, shorts still have an opportunity to manipulate. A little dissapointed at myself for not having realized this and held off my buy until post 15th of the month.
Good luck to all,
Sandman