Octopath COTC GEP Yan Long in 5 turns (Discord request - custom roster)

Custom fight requested on Discord. Olberic is MVP in this custom roster protecting everyone and dealing big damage.
Sigrid with Kurtz's A4 would be great if Yan Long didn't clear debuffs every turn.
Two approaches: one of them assuming Kouren can deal good damage, and the other using his BP mostly to buff Olberic with a dmg cap up sword.
0:00 Intro
0:29 Fight 1 - T1-T3 Prep break
2:52 Fight 1 - T4-T5 Break and kill
4:17 Team and loadout 1
5:00 Fight 2 - T1-T3 Prep break
7:35 Fight 2 - T4-T5 Break and kill
8:55 Team and loadout 2