User blog comment:Strife237/MobiusBound 55/@comment-477304-20121130200544/@comment-26113388-20121130201302

The only reason to I can think of off the top of my head is because Knuckles lives on a floating island and so does Poo. Let's look at the similarities between Poo and Shadow


 * Both are highly disciplined
 * Both possess great power that the others do not
 * Both use weapons (swords)
 * Both differ from the other team mates in ways
 * Both of them seem to enjoy peace and quiet and often stay still with their eyes closed
 * Both are very serious

If you still think Knuckles is more suitable, I won't argue, but this is what I believe