His attitude was in some ways self destructive during 13 yes.
But, he filled the gas cans against his better knowledge, he lowered them down and even did as he was told while he was grieving in respect to Burt and whatnot. 19-3 shows not just that he is in those final stages but that he is going to be looking forward to protecting his last shred of Hope. (Ha)

Because Kalani doesn't drink isn't the only reason he is suspicious, but how would he know about all these Supplies to the east when he is kissing up with Burt, even if he is just guessing he knows more than he is letting on about something. I can't think Datu is the mole because of his behavior, yes he is major depressed and seemly giving up on survival after watching his possible lover being ripped to shreds. Even after this he has the power to run out of the arena, he has to desire even on the brink of mental breakdown to keep pushing forward. Kalani mean while shows up, he is being screamed at by Mike, being told that the new tower has NO WEAPONS/AMMO/FOOD upon arrival. Then he has to deal with the fact that suddenly this new home of his is filled with partying ragoons who don't seem to be taking survival seriously.

I wouldn't take much for him to start looking for a way out either on the CB, or with someone physically like a Bill.

We should agree on atleast 1 thing Nik before we continue.
Was there more than 1 person involved in acting against the Tower? Was the food Bill and the CB call someone else?
I so feel like he woke up inside the arena and decided it was time to take control of his life (playing possum, getting close, then accomplishing his goals...)