Part of the reason that this recover seems to have gone well is that the 
system booted up and gave me access to everything.

How would I have been able to complete the recovery if it had been the boot 
device that had failed?  

From what I understand, and from past experience of when software RAID1 setups 
have failed, it isn't possible to boot using the second drive.

Ideally, in that situation I would want to make the second drive the first 
drive, add a new blank drive, boot and the complete the exercise above.

What do I need to do to make the second drive bootable?

Both sda and sdb are currently identical.
/ is /dev/md125 which is sda3 and sdb3
/boot is /dev/md126 which is sda4 and sdb4
/boot/efi is only on /dev/sda1

Would copying  /dev/sda1 to /dev/sdb1 using dd  be enough to make the second 
drive bootable if the first drive fails?
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