I just took a look at the "Leonard" surname board and there are seven articles that I re-posted there on the Leonard surname. So if you have not, you may want to take a look at them all.
Also you might want to take a look at the Decatur website where the articles orginate: www.rootsweb.com/~iadecatu and be sure to take a look at the "surname notebook" someone listed is researching the Leonard surname. The site also has a search engine, so just put Leonard in and see what comes up. Check back because I re-post all the time.
You can even subscribe to the site, its free, post whatever you like on your family and see what kind of responses you receive. If anyone knows anything you will hear from them. There are a lot of people with roots from that area subscribed to the list.