Disk Allignment and Spanned dynamic disks

My question concerning alignment with spanned disks is this; I have a situation where I am adding space to existing spanned volumes in a Windows server. When I presented a disk to the server my thinking was to align the new disk then extend the volume. This did not work since the new disk is seen as a simple volume, I had to delete the partition the I could add it the spanned volume. I assume I lost my alignment when I did this but I felt I had not other choice. It was the third or fourth disk on the set and quite large. Is there a more preferred way to extend large disks yet keep them dynamic so I can get drive of 3-4TB and larger without loosing the data? Additionally if the first dynamic disk in a set has been aligned ( I assume you can align a dynamic disk? ) then would the additional disks that get added in a span need to also be aligned or would they not need this? Any insight would be appreciated.