Yah, these 2 are unpredictable.
SMRT deployments are very messy though these days, If you really
want to do, Just make sure you have all the time in the world, if
not you just have to know your fleets well.
Just like the status of 664S is pretty hard to gauge, Last week
it swapped with 566S, this week, Sunday it got replaced by 571B,
Monday 576M, today got dragged to 654X's slot. Not sure if I do see
664S tommorow though.
