Salem said: As we can see, paste leak is not as big problem as yukkuri comics made it to be. Too dry to leak out like diarrhea
But the lives of Yu's seems to depend on having animated bean paste inside them, and when it slows down or stops moving they slow down or die (or in one case, they retain memories longer). So a regular manjuu is the same as a dead Yukkuri, while the looser magic bean paste of living Yukkuri's is what makes them live in the first place. Thus, living Yukkuri have more runny paste.