... Spades Slick was definitely forgotten by the ending though. He gets decapitated and then is just .. gone. We don't even get to see his body disintegrate or something. No closure. ... Also whats up with Carapetions not getting into the dream bubbles?

Carapacians aren’t players. As fun as they are, they’re still NPCs and constant across Sessions. The presence of non-Players in the Bubbles is rather dubious- WV’s dream seems more like an actual dream than a memory- But we know from Jade’s first dream that normal dreams can still happen in the Bubbles and Vriska also appears in front of him, implying WV DID dream in the Bubbles? There’s also 3 Carapaces emulating the Problem Sleuth characters and the Lusii around, but whether they’re part of the memories or actually dreaming/souls is hard to say.

As for Spades Slick, I mean. He’s a Villain? Only driven to pretty much give the middle finger to Lord English and get payback for the bullshit back on Alternia. He tracked after him, got into a three-way fight, and ended up dying. There’s not much… Closure he could’ve had? Even the Jack that survived still took over the Felt and went to Earth to try and fuck shit up. Jack is just. Murderous and Dangerous. There’s no closure for the guy, only more stabbing and grudges.