As mentioned, the Brown Derby does have the Hollywood Brown Derby Lounge, which has some outdoor seating and the Cobb Salad is on the menu. The Lounge is first-come-first-serve in terms of seating, but it is like a TS in that there is a server that will come take your order and deliver your food. It's not kiosk or quick service location.
I would keep my table service reservation. As previously mentioned, seating in the lounge area is first-come, first-served (or first-seated.) So you may show up when there's nothing available and have to wait longer than you would if you just showed up and took advantage of your ADR.
Also, the lounge is entirely outside. So if there's inclement weather, you're sitting in it.
I also recommend that you keep the reservation. The Lounge doesn't have many tables and depending on what time you go and how many in your group, you might have to wait since it doesn't take reservations.
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