Thank you for your patience.
No that is not necessary because, as stated in Burlerson v. Whaley, the policy of the court is to facilitate closure of the estate with as little delay as possible.
Requiring an heir to come up with the money to purchase what they essentially own is contra indicative of that.
Rather, the heir choosing to buy out the others would either provide a check directly to the executor or the heirs (depending on the contract terms as negotiated between the estate attorney and the heirs). Often times, for larger estates, the heirs will agree to a redistribution- for example, the heir keeping the real property will sign over their interest in bank accounts and other property, until a fair balance is reached.
Once the contract specifies who is to pay what, the executor executes a distribution deed to the heir retaining the property; the accounting would have the required paper trail and accounting information indicating the transfer and buyout.
Some heirs need to get financing (estate loan or inheritance advance loan) before effectuating the buy out.