Bee has samehada. Still he is not using it just like kisame did against him. I think he can absorb only some part of chakra. Maybe samehada would die if it absorbs too much. (samehada is a living sword so dont think it cant die).
lol If they can barely lay a finger on obito... what makes you think they can hit him with a big ass Shark sword lmaoi wonder what would happen if killerbee used samehada to absorb obito's chakra cause if i remember correctly the jubi has immeasurable chakra and madara has limitless chakra and stamina but obito doesn't and he is one of the 2 uchiha controlling the jubi so if killerbee used samehada to absorb obito's chakra would that help make the jubi even more uncontrollable maybe i'm wrong.
this lololollololololololololololThe Juubi has more chakra than Bee so i doubt it'll be able to resist switching sides.