I guess even if it's a Council, There's still a person that's more influential than the other. Baine doesn't rule all decisions with a iron fist but his words does have more say compared to the other Council Members. The Horde has suffered all kind of damages and is far from their primes at the moment so it makes sense that Baine's net worth is higher than the other members within the Council.
The Horde's leadership is always changing and it won't be long before it changes again. Possible future choice includes Thrall returning as the actor or even Garrosh if we bring him back from the Shadowlands. He was one of the greatest leader of the Horde in many other realities except this one but things could change now that he's in the afterlife. He had a eternity somewhere in the Shadowlands to reflect upon his past action. And since the Shadowlands is span across all realities. He might find guidance and help from his other reality versions in the Shadowland. It won't be surprising if he strive to be a better person once he comes back to Azeroth.