I took Davith Elso to the Final 4 of Gencon/North American Championships last year.
I ran the following list:
Luke Skywalker, Hero of the Rebellion
Gideon Argus w/ Diplomatic Mission
As has been mentioned before, Davith relies on being Hidden and/or Focused to maximize his potential. If you're running him, then his "Vanish" is essential. That card is just amazing when it comes to capturing an objective, or setting Davith up to wreak havoc on your enemy's back line. If I drew this card early, then I would be very aggressive with him, hoping he would draw just enough fire to protect my other figures without dying himself, before I could Vanish when he needed to. I cannot overstate how great that card was, at least in the meta back then. I'm sure it's still really good, especially with so much offensive potential some teams can field.
I used Obi-Wan as the vanguard, slow moving, but hard-hitting and hard to kill. Davith would flank whatever the opponent used to counter Obi-Wan, and hopefully I could outmaneuver them while using the Twins to add significant damage from midrange.
If anyone has any questions for me, I'd be happy to answer them. Without being cocky, I've maybe taken Davith farther than any other in competitive play? I haven't used him in awhile but he was great back then.