and later on when i need to breakthrough him (i will work on power first as i am 15k behind), what event should i save for to get him? by the same calculations, 100 fragments would cost 22k but i read that https://forum-narutoen.oasgames.com/page/show-post-40456-1.html it would cost from 15k to 26k which is quite a gamble. even if we assume there'd still be 20 fragments left the cost wouldn't be that much greater based on luck.

but for a solid calculations indeed ramen party seems to have the benefit here.