Yes, array has not been restarted.
My plan was to assign the new disk only, format it, start the array with the all the disks (new disks included) after clicking "Parity is OK", shut down, reboot and rebuild parity.
I have a few servers, this particular server has issues, every few months I get UDMA errors sometimes resulting in a disk dropping off the array, a new config retaining all disks corrects it (it didn't this time), I then do a connecting parity check. I've replaced disk back planes, cables, disk controllers, everything except the motherboard which is too big/expensive a job.