If I follow, your client is an heir. The value of the estate seems to have been set. Since then, the estate value has dropped. Your client likely needs legal counsel. If you client is an executor/administrator, they may be liable for not managing the estate in the best interests of the estate. If your client is simply an heir, they may want to pursue action against those managing the estate, even before settlement.
With the given scenario, the estate's goodwill value drops daily, the longer the former employee has no "competition" for the existing clients (assuming as written, the remaining employees are not really competing). If the current value of the business is truly just sale of equipment, then whomever is allowing the business to continue accruing salary and other expenses is clearly not acting in the best interests of the estate. (Makes me wonder if the aunt is running the estate, as she is the only one who seems to be benefiting from the "business".)
On the other hand, if the restructure was some form of the executor/admin "selling" the business, then there are a larger number of worms to deal with, especially if your client is one of or the only buyer.
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I would not touch any part of this estate process at all. I would refer to a probate/estate attorney, who also has probate/estate expert accountant/CPA/EA's on staff. If your client has already taken on former estate assets or liability in some form, then maybe deal with that on its face, but only if your client is accepting what they have done or allowed to be done, and is not interested in getting a second opinion (which seems not to be the case).