Most of the time yes, although I theorize that "excreted bean paste" tends to rot early on, than from bean paste through wound/injury. So in a sense, yukkuris excrete filling from their bodies that nears expiration.
And as long as yukkuris aren't told (or has seen) that the food they're eating are actually yukkuri poop, they would still exclaim "this shit's good!"
That makes sense, it explains why yukkuri's memory is so short. The older bean paste is excreted after it has rotated through the body, taking earlier memories with it.
I think the orphan alice arc ended. In the end the Flandre types swoop down to presumably eat the falling Alice... unless a new arc comes up thats what I'm going with.
It is said the artist stated that there would be two more arc of orphan alichu which means 18 & 19 will be the last two. Probably scratching. So this one is posted ahead of schedule.