Hello RR_NDB,
For just a moment, I thought you had strayed off-topic: saying "CRM inside BA cockpit must have alternative options." Most people here in the UK use "BA" - in an aviation context - as an abreviation for British Airways. Boeing is Boeing, and CRM in a cockpit can be just as complex as the charging and monitoring system of a multi-cell Li-ion battery...
But if you suggest that Boeing must have had a Plan B (or more) somewhere up its sleeve, that makes absolute sense. Are you further speculating that Plan B might have been rejected by the FAA?