Does anyone know what kind of contract the cast is on? It seems like most would be on a principal contract. I also find it highly unlikely that anyone in the cast is making Equity minimum, as very few actors in a musical make the true minimum because understudying, doing a speciality skill, being a fight or dance captain, and "extraordinary risk" add to each contract.
And if Jennifer Laura Thompson, a veteran with 2 decades of experience, a Tony nominee, and a lot of respect in the industry is only making minimum, she needs a new agent.