These yukkuris on the right look pretty strange. I am not so sure that they're really hatless marisas. And it seems that rorinko is taking artistic lessons from ammo.
That marisa in the first row looks like one of ammo's yukkuri. She's a dead ringer for his koyukkurisa from "yukkuri can't poop" comic - art style is very similar. But this is (most probably) based on post #8678.
This brings up a point I was thinking about while reading those comics. Unless these overstuffed yukkuris are absolutely delicious (IE truffle-quality), the work needed to cultivate them seems massive. They were manually struck each time in those comics every time they pooped. And all that effort was just to create a few of them. For the amount of work put into them, they better be goddamn tasty. Although I suppose they could figure out a way to automate and mass-produce them...
>>all that effort was just to create a few of them I think the original experiment's goal was not just to just train a few of them, but for "DO NOT SHIT" to implant itself in the yukkuri DNA. Were it successful, all they would need to do is breed their descendants without having to train each new batch all over again.