The sleeping Acacia Dragoon and the Black Dragon both created dream spirits (Turnip and Marbule's Black Dream), and none of them were Gurus.
But the Acacia Dragoon's could have been because of the split and the Black Dragon was having a nightmare... And it all later dissapeared.
Whatever is the reason for the Acacia Dragoon, the result is still here: he managed to create a living, talking turnip out of thin air, just by sleeping. And guess what is Gaspar doing in the End of Time? He's sleeping *hint hint*
As for the Black Dragon, he wasn't "just having a nightmare", he
was having a nightmare. He sleept and from his dreams some Lagoonates materialized. Oh and, they disappear because you frigging defeat them one by one in battle...
It's totally my baseless interpretation, but I think that if Spekkio would kill Lavos, he will die too... He's as strong as the person beholding him right? so if the beholder dies, he dies too! That would explain why he never faced Lavos or never actually killed the party (no game over when you lose to him).
and that's why he still exists when there's no one beholding him, right? I think he'd just return to his normal form (whatever it is) if he killed Lavos. Unless there's a witness to the battle. The reason he doesn't kill the party is because he's not EVIL! Fuck The What?
How do you know he's still there when there's no one to behold him? He claims that he looks like the beholder, so it's legitimate to think that no beholder = no Spekkio. Spekkio means mirror in Italian by the way.