Brandon_K
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Brandon_K's post in Issue Using 22TB SAS Drive as Parity with 22TB SATA Data Drives in Unraid was marked as the answerSAS is just a different interface, the platters and formatting themselves are usually identical between the disks. IE, a WD HC530 14TB SAS disk is 100% identical to a WD HC530 14TB SATA disk, other than the physical interface and controller on the PCB of the drive. So yes, it's absolutely possible and logical to use a SAS disk for parity. You gain nothing with SAS over SATA. You might encounter spin-down issues with SAS disks, which will cost you more power. The HBA will certainly cost you more power as well as most of them don't support ASPM unless you've bough a recent generation HBA.
2) Plausible, but unlikely.
3) That would certainly eliminate any potential issues, but those issues are so slim that it's unlikely to occur in the first place.