It depends, It could mean characters that Battler initially thought where dead where actually playing possum. People like Gohda and Kumasawa. It leaves a little more wiggle room for Yasu to carry out the scenes. While Battler walked around the mansion with his hatstand spear, Yasu was offing people that where outside of it and then offing herself.
It brings up a problem if Maria was still alive at the time Battler did his check. How did she die later? Was Yasu still alive? Did she commit suicide? Did she somehow leave the island thus dodging the red near the end of the episode?
Of course it could mean that RK07 was oblivious to it. How in depth he went with this particular corpse makes me doubt it, he even had Battler go "Its just like in those tv shows". Then again, surviving a drowning incident without human intervention happens in tv shows too when it should be impossible, maybe Im giving RK too much credit here
