Im not sure what gives you that impression there. There is no way in which to fix this issue. You are trying to fix something that isn't something that is broken. If you deleted members, it will not change other peoples IDs to ensure every ID is populated as you are suggesting. You stated also that you changed some of the tables, but there are a lot of tables. If you do that, you will very likely break your site. If you feel I havent answered a specific item there, you would need to clarify