Starting Pitcher ?

So I have a 30 mill team going. Went very cheap on pitching. I have a 5 man rotation with one pitcher (Jack Billingham) who is an S6*.

I would have thought he would pitch every 4th day and the others would just kind of fit in around him. However, he is pitching every 5th day.

I feel like I should know why this is happening, but not sure why.

Just put him at number one in your default rotation (and don't list anyone else.) That should work.

HALwill always start the highest salaried SP who is rested.

Use your per game starters and he will pitch the max.

In default rotation put Billingham first, and then any SP only. That will give HAL the option of bringing in any SP/RPs you have that are rested yet not pitching because Billingham has the *