The strategies seem to work out very well, thank you for making it easier for me to level my pets!
The one against Mo'ruk seems to be very luck based though, and after using the Fluxfire and Nexus Whelp and lost 9 battles in a row I decided to try to improve it and came up with a one that seems a lot more reliable!
I follow the first part of your tactics, but once the Fluxfire dies I send in a Onyxian Whelp instead, using Lift Off to avoid Lightstalker's Moth Dust, then just dpsing him down with Tail Swipe and use my Healing Flame if necessary. Then I just repeat the tactic for Needleback, using the Lift Off to avoid Headbutt and just dps and heal if necessary, and it works like a charm.
Hope it can be of any help!
Another option which has been very reliable to me is:
1) Lowlvl pet (soaks the first attack - might need a bit of HP to survive, and with higher HP it can soak the burrow)
2) Emerald Proto Whelp  (emerald bite, emerald prescence, emerald dream) - finishes off the moth and grub and perhaps the last pet
3) Spawn of onyxia  (tail sweep, healing flame, lift-off) - takes down the last pet if RNG kills off your emerald proto, or you let the emerald proto die to finish off the last pet faster. Could also use Infinite Whelpling  (tail sweep, healing flame, early advantage) - though you would be best served by killing the second pet with Infinite whelpling to get the dragonkin bonus dmg for early advantage (can take off about 1k hp from the last pet in one hit, depending on your hp compared to the enemy pet).
Also, Jade Oozeling  (absorb, corrosion, acidic goo) is extremely effective against a lot of trainers. Especially vs Zusshi, Yon and Aki. Start with acidic goo, then corrosion (reapply if the enemy avoids it with liftoff/burrow/miss), then do absorb to heal for about 330 hp for two rounds, at which point the dot's tick their last tick and the enemy should be dead). Usually paired with fluxfire feline , though that may change with the fluxfire nerf in 5.2 (whereupon fluxfire feline  might compensate for the nerf at the cost of speed).
I am looking forward to the legendary pet battles, just to try out ghostly skull (ascension for +25 % dmg for 9 rounds) paired with jade oozeling which then would gain an obscene ammount of dmg and self heal.