The originating attorney report allows you to keep track of which attorney is bringing in which matters and payments into your firm. You can also use it to track how much money each timekeeper collected from their individual time entries.
If you want to see which attorney is specifically earning the most money for your firm from the work they bill, change "Originated by" to "Any user" and change the "Billed by" field to the attorney you're interested in tracking.
Note: With partially paid invoices, all payments are allocated evenly across all items on the invoice. For example: if an invoice has a payment of $100, and there are 5 entries on the invoice, each entry will receive an allocation of $20.