I noticed that the very end of Stagnant exists of half a minute of silence. Does anyone know why? There must be a purpose to it, knowing that Devin is such a perfectionist.

That's to separate it from the hidden/bonus track, Humble. It's also between Unity and Noisy Pink Bubbles, for example. It's a trick used on many albums by many artists

theres some dialog there too if you turn it up loud enough... "right im good, next... ok. my foot is sooo asleep .. .is it? .. yep."