


A theory; the stronger the soul the longer it'll last
Even though it has been mentioned that the Thorn Bulb would only last a few minutes before it disintegrate in to nothingness the past example with Shinki's and Moegi's Thorn Bulbs proved otherwise. Realistically, there's no way Araya could carry the Thorn Bulb alongside Yodo in the in the middle of the desert and reach Sunagakure in just a few minutes (unless, of course it somehow happened through reverse summoning behind the scene), and the same thing also apply to Moegi's Thorn Bulb having to endured longer than a few minutes due to the party's scuffle with Jura.
This only means one thing; Shinki's and Moegi's souls are stronger (unlike Bug's) therefore their Thorn Bulbs can last much longer even long after their Shinju have been defeated, it's just a theory of mine, though. What do you think?