So the condesce was in johns world as very Crocker, filling gushers with troll blood, then somehow got to Roxy' s world? Via cherub portal?

We don’t know how she went from Alternia to Earth and from Earth to the Post-Scratch version, Cherub Portal may be an answer but there could also be something with LE’s powers, we may see in Hauntswitch/Hiveswap!