As you suggest there is no need to go through probate:
1.Does my brother have to notify anyone that there will be no probate?
2.Do the executors (all 4 of them) have to make a formal agreement that there will be no probate, in the form of some legal document?
3.If there are no executors, who is supposed to notify the credit card companies, & chase the outstanding invoice,etc.? Can his old secretary or me do it?