Extended raid 5 is not expanding

This is a bit nuts... That's too many disks for a RAID5. It's offset by the fact that you have two hot-spare drives, but damn!!

However, you've already expanded the underlying Array, but not the Logical Drive. Remember, the "Array" is the physical grouping of disks. The "Logical Drive" is what you assign RAID level to. You can have multiple Logical Drives within an Array.

array A (SAS, Unused Space: 8974754 MB)

That's your unused space, so you can create another Logical Drive out of the free space, or expand logicaldrive 1.

ctrl slot=1 ld 1 modify size=? or ctrl slot=1 ld 1 modify size=max

<target> modify [size=#|min|max|maxmbr|?] [forced]
   Extends the logical drive to the specified size. The implied units are MB.
   max will extend the logical drive to its maximum size. maxmbr will extend to
   the maximum size the master partition table allows. The target can be any
   valid logical drive.

Unused Space: 8974754 MB - that 8.55TB. There's your missing space.

You should be able to expand it with hpacucli command (modify size=max parameter).