Pao looks like he'd be effective behind a CLS lead. The usual CLS counter-attack squad with Chaze & Raid Han would have Zeta Pao taking very frequent turns with oft-refreshed cooldowns. Use those turns to throw some Sonic Grenades and suddenly all enemies have Defense Down. That means anytime CLS counter-attacks, he's stunning his target.
To Phoenixeon's point, though, the combo only reaches it's real potential with the boost from Pao's zeta. Once you commit to that zeta, though...the countering and stunning would tear apart a lot of squads relying upon AoE attacks.