From the screenshot which you have posted it, I can see that this is a FAS2050A system and so the disks marked as Partner in this case are not of concern. they have been assigned to the other controller.
If it was me the first thing I'll be doing is trying to bring disk 0c.00.06 into Aggr0. As it is showing as unowned, it may be the case that you can just use the 'disk assign all' command to bring the disk into the controller. It should mark itself automatically as a spare.
Your aggregate is built with 15K RPM disks and spare is 10K RPM disk. By default NetApp won’t allow mixing different speed in the same aggregate due to possible performance impact. If you have no way to replace spare disk with 15K RPM one, you could change raid.rpm.fcal.enable to allow mix.
Please post command output inline in message text. I use e-mail to read and reply (and I expect I am not alone); having to click click click through all screens just to see attachment takes far more time than simply answering message.