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RAID5 recovery trying with "mdadm --create ... missing"

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http://unix.stackexchange.com – First how I got in this situation: I had an RAID5 array with disks each 2TB (external USB-disks), I then wanted to create a larger encrypted array. Therefore I got 2 additional disks (also 2 TB each) and the plan was to run the original array in degraded mode, set up the new encrypted array, copy part of the data, after that shrink the original array to 2 disks degraded mode, enlarge the new one, copy the rest of the data and finally enlarge it to 7 disks RAID5 non-degraded. I did the whole procedure with /dev/loopX devices 2GB each to test if my plan has any caveats. Everything went well wi (HowTos)