In order to preserve Wilk's face, he had to use a preservative possibly formaldehyde. Placing the formaldehyde soaked face onto your own face which has no skin for most of the facial area is a bad move.
Tsurumi's sanity, that boat sailed a long time ago. That said I'm with him all the way, fuck Wilk, Asripa, Sugimoto and Shiraishi should just take some of the gold, and give the majority to Tsurumi. It just ain't worth it