Both of these are actually correct (except maybe the genius part). Gailey saw both Jackson and Spiller work all week. He should have seen that they were not ready to go, But not only chose to play them, but also not switch to Choice once he saw the issues during the game as well. If Spiller and Jackson would have shined, that would have been interpreted as Gailey seeing they were able to play at a high enough level, as any coach at the NFL level should be able to do.
So in summary, if they played well then Gailey is not a genius, but rather a coach that can see if a player is capable of playing or not.
As it turns out, either Gailey is not capable of determining that, or was so desperate he played them anyway. You make the call.