>>532591773
Right know, the most likely theory behind it is that Rover erased his memories because he knew too much and need to become the active participant and "more human", to actually change the future.
>>532592447
It's either something that made him wipe memories, or the old Rover actually want Rover to experience some form of loss or mistakes, like in 1.3 with Shorekeeper and the core, or now with Phrolova