Yokai Event Rerun..

[Bourne_Endeavor]

but that this event comes back, yet all the other ingame events are staying exclusive while the items are landing in the mog station..

Actually, it may have to do with licensing agreements and not abrupt favoritism. Unlike every other event, SE doesn't own the exclusive rates of Yokai, thus they cannot sell copyrighted material. That's likely why the event returned since it's promoting Yokai again whereas just stuffing everything on the Mogstation doesn't benefit anyone except Square Enix.