Right, I see where you are coming from.
Basically, every time the sim spawns a random group (as according to the properties you have given it with regards to entry and exit dates, individual ship probability etc) and it has generic ships in it, it will pick from a list of ships that are available at that time. if the exit date of the group and the availability date over lap, and you have a generic battleship assigned to the group, there is a chance you will get that particular type.
In this case, if the group exit date is before the availability date of the Yamato then you should never see her in that TF, But obviously, if they overlap there is a chance she will. To avoid seeing here in TF's after she becomes available you would have to remove all generic battleships and replace them with specific types.
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