I just wanted to say perhaps the Lingering Will had moved in KHIIFM+ due to the explosion at the end of BBS. We know the wind carried Aqua and Ventus away to the Lanes Between. So perhaps, the wind shifted the armor. If the armor was fixated, then it's also likely that the rock formation was destroyed and he is precisely where he was, just on a lower level. Who can say, but there are some 'options'.