Simple answer: very few floating debris, very very lucky that one was confirmed. If there had been lots of seat cushions and the like, they'd possibly turn out in both locations. Animated debris field is probabilist, given the currents, not actual. There are many possible routes, but if one drops at sea within a few hundred yards three half-floating objects without variable "sail" surfaces exposed to the wind, chances are they will be sheppered by oceanic currents to roughly in the same geographic area, a few months later. Except right in the middle where the dominent Indian ocean current splits! Whatever, conspiracy theorists craft, use, recycle or invent whatever can suits their irrational view of things. While annoying, it is a common human reaction in an attempt to bring a sense of order where there isn't yet. You just can't prevent it.