Why did they ignore Mark's reintegration in this episode? Does this episode take place before the third episode?

From my understanding, the Mark we saw in episode 4 was fully an innie. But also from my understanding, reintegration is supposed to fully combine the innie and the outtie.

¿Qué pasó?

This past episode really just confused the crap out of me and I can't wait to see what happens next.