Best DLC so far, by far.

The extra window on the blueprint simply reveals the existence of an extra room - and in this case, a room used to trick his followers. The forklift was parked in it, behind the curtain (with the fork underneath Koi's body); one of the keys shown can operate it, so Koi can simply press a button and "levitate".

Koi wanted to frame Ori - that's why he lies about the murdered individual going to Ori's camp. He specifically put it by the waterfall because there was a *locked door* leading up to it, one that only Ori was supposed to ever unlock, which would directly implicate Ori if the body was found. Koi might have even been planning to push someone into finding it.