The only downside to using Lumi in this event is that you will watch Yoda steal her Evasion Up bonus a lot which can be annoying but her strengths far outweigh that downside. Plus, she is easily farmed to 7* through GW shipments and because she is such a good all-around character she should be one of the first characters that you max out anyways. She also has a passive heal bonus on her leadership skill, the best ability heal in the game and she hits really hard for a Jedi. While Barriss improves your survive-ability through extra health, Lumi increases survive-ability through her Evasion bonus. Most of the players that do not beat Yoda with Barriss lead are using Luminara as their leader instead. Luminara Unduli (Farmable in Galactic War shipments, Light Side 3D, 6A and Dark Side 2E): Lumi is another key component to defeating 7* Yoda, and is usually used in conjunction with Barriss.I highly recommend farming Barriss for this event. Her passive heals from her leader ability and basic attack are also valuable for keeping your Jedi topped off on health.

While I know of several players who completed the event without Barriss, the 20% Max Health from her leader bonus allows you to survive and extra hit from Yoda which means a lot when Yoda is taking 2-4 turns between each of your heals.

Barriss Offee (Farmable in Cantina 6A, Dark Side 5C, 5E & 8A): Barriss is a key component to defeating 7* Yoda.

Below is a summary of all the Jedi and their value in my opinion for the event: If you are a F2P or low spending player, this means that you will need to plan ahead well before the event begins to farm and upgrade your Jedi to an acceptable level. Unlocking Yoda starts out with obtaining and upgrading 5 Jedi to participate in the event.

Aayla secura galaxy of heroes