If you are interested in the backstory of Gladiolus, that’s your best chance.
Yesterday we’ve shared 15 minutes of gameplay from Final Fantasy XV’s expansion titled Episode: Gladiolus. The upcoming DLC now has a proper release date and will be available separately and for Season Pass holders on March 28th.
As the title suggest, this add-on will allow you to play as Gladiolus accompanied by Leonis. Both with fight new enemies, get fresh equipment, while discovering some mysteries from the past of the titular hero. It should take 2 to 3 hours to finish.
https://www.youtube.com/watch?v=HGTmFU8uxLo