Confusion as to the meaning of `cid` in webform.module
A quick look at the webform_component table in the database, the description for that field is: "The identifier for this component within this node, starts at 0 for each node."

In my test, however, the first component has a cid of 1.  AND - keep in mind that if you delete a component, the next cid is incremental - so you can't assume 1 - 6 or whatever.