Easy solo-ed with one moth.
Edit: XP gains have been restored with Patch 6.2.
I pretty much soloed the whole team with a Mechanical Axebeak (Alpha Strike, Haywire, Decoy just in case, but I never came close to using it), had a mechanical pet (used Darkmoon Tonk, but could be pretty much any pet with a mechanical ability) and any third pet.
As with the current XP nerf for Kira/Eris, I never bothered to bring the leveling pet out.
Opened with the Mechanical Axebeak spamming Alpha Strike on both Moon and Mouthy. They died pretty fast and barely did any damage.
When Carl came out, used Haywire and he went down to under 100hp left, when the Axebeak stunned. Swapped to a pet with a Mechanical attack, and gg.
Just use Decoy when whirlpool has 1 rounds left.
When Mouthy comes in, swap to lvling pet (can be lvl1) to soak the stun, then back to dragonling to finish him off.
Just don't forget to use Thunderbolt whenever it's off cooldown, and fill with Breath.