"yes but they would have like 9999999999999999999999999999999999999999 and we would have 999999999999999 "(because they had started from kingdom hearts 1)

BUUUUUUUUUUUUUT, roxas was nade when sora turned into a heartless, and theres Chain of Memories, so those tell us that we were already being created during KH 1 so we should have equal numbers, and besides even if we dont have equal numbersthe heartless are weaklings compared to the 13. we could slaughter 3/4
s of their numbers by ourselves

"true but the 13 have there limts 2"

even if we dont even kill them all, if we lower their numbers enough then kill jason they wouldn't be a problem. in fact the 13 probably wouldnt need to fight, the nobodies can take care of them

"ok if u want to kill jason u can kill he with u or u and me or u and dragoon but if u pick me it wont be fun 4 u because u no i dont waste time"