Trading programs in Enable are extremely versatile, and the trading program lead is just another characteristic that can be recorded against a trading program.
In Trading Programs, each trading program with automatic approval workflow will have a trading program lead marked against it. The trading program lead will be the user who has started the approval workflow process. This will be carried through to the active trading programs tab once the trading program has been fully approved. This is so you can track who decided the trading program was ready to go through the whole approval process.
Please note that only users in the workflow roles that are configured to be able to start workflow are able to be trading program leads.