Although you'd have to remember that the Zandalari had massive loses in BfA. The war with G'huun and the Blood Trolls, a massive part of their army following Zul when he dethroned Rastakhan(that army you trolled and bombed in a quest ingame was bigger by far than anything Talanji could muster later in my opinion). On top of that the attack of the Alliance. And all the loses the Zandalari had back in MoP. I question is, can Zandalari trolls multiply as fast as other troll tribes. If they can, they could recover faster from this, but currently i don't think they are that powerful in practice. They have big potential though.
The other part i would disagree are the Maghar Orcs. There was a blue post that clearly stated, that the "army" and representation of the Maghar Orcs, Ogre, Gronn and Ogron ingame wasn't well done to represent the size and power of the Maghar who were teleported to Durotar in the questline. Because apparently the spell was not limited on that small settlement we saw in the quest, that was besieged by Yrels forces, but the spell teleported Orcs, Ogre, Gronn, Ogron etc from all over Gorgrond to Durotar and the blue stated, that their numbers are large. I hope they will get a proper settlement somewhere, or better a fortress like Blackrock Foundry, and some fleshed out characters from all the clans. If their can be an AU daugther of Durotan and Draka, there could be sons and daughters of the other warchiefs as well. I personally don't care that they are from an alternative Universe at this point. The Orcs and Maghar are in dire need of some awesome characters who are not Alliance pansies.