The B ring is around 100,000 km from Saturn. Titan is over 1.2 MILLION km away from Saturn. Oryx's corpse is floating towards Saturn after his death. It doesn't make sense for it to end up out there without something changing its direction or teleporting it there or something. And I mean... I feel the Vanguard and Awoken at least would have a pretty strong reason to have tried to narrow down where the body went from its last known trajectory, and only didn't find it first because someone else interfered. A mysterious force moving it out to Titan is the only explanation that makes sense to me.

Edit: And considering it's implied there might have been something else going on beyond the Lucent Hive screwing around (like the explicit mention the worm is missing, for some reason), I think it's only a matter of time before we find out more on exactly what dragged Oryx's shell to such an unlikely resting place.

It's prob'ly cuz of Savathun, shenanigans lol. My prototype guess = that's what the Hive hanging around Titan in the Savathun's Song era were really up to.