User blog:A.J AL/Season six plot hole.

The entire season revolves around castiel trying to open purgatory to absorb the 30-40 million souls in there in order to defeat Raphael. What doesnt make sense though is that when castiel is shown visiting hell with crowley, it is shown that there were almost 7 BILLION souls in hell. So Crowley lends him 50 thousand. The logical move for Castiel to have done was kill Crowley, and absorb the near 7 billion souls in hell and become much more powerful than when he absorbed 40 million souls tops from purgatory. This way he would have been uber-uber powerful and not have to deal with the leviathan AT ALL. He would have stayed Godstiel! This is how season six should have logically been. Thoughts?