The main problem with this obstacle is the swamp. He can't move very well in the swamp, so he will encounter problems once he steps into the swamp.
Using the diamond physique will only ensure that the crocodiles don't kill him. It won't stop them from dragging him down to the bottom of the swamp.
Mind Overseer might be able to repel the crocodiles, but it won't stop his heavy body from sinking to the bottom of the swamp. Seeing as he doesn't know how deep the swamp is, sinking is a problem that he should try to avoid.
He might be able to keep himself alive for a while longer underneath the swamp by siphoning the life force of the crocodiles, but again, it won't solve his main problem.
"For all I know, once I get into that black swamp, I won't be able to get out."
The whole swamp is black. The warning from his extraordinary perception ability is clear. Whatever he does, he shouldn't enter the swamp.
