User blog:General MGD 109/How Strong Are Ghosts?

Pretty self explanitory, it strikes me there seems to be a discrepancy in how strong ghosts are, Bobbies ghost, was able to knock out a Leviathan, and knock about Dick Roman, the strongest, meanest Leviathan of all, who's strong enough to beat angels.

Johns ghost, was temporalily able to hold Azazel, the strongest demons, Sam and Dean in an Astra state was able to fight with Alaistiar, who is stronger than angels ect.

However when on the rare occasions that the brothers get to fight with a ghost, they generally come out on top, granted they can't hurt the ghost, but it strikes me if at there maximium ghosts are as strong as Leviathan, then surely one of the higher ghosts, such as Whitham Van Ness, should be strong enough to snap them like a twig.

Any ideas anyone?