I agree with you too CeeBee, so when dealing with RAID arrays always have a good backup and yeild on the side of caution when building or deleting an array. If you are unsure of the procedure since it appears there is no standard way of handling these types of scenarios consult your documentation on your RAID card before you go deleting or adding anything.

Best of luck and I hope we were able to provide you with some insight to your question.

Take care & Merry Christmas! =)