Well, I'm now officially that someone. 🙂
After asking my Apple rep (they can be a handy thing to have), who checked with Apple engineers for me, they couldn't come up with a solid reason that it wouldn't work, just that it might not be fully tested or functional under < 10.4.2.
So it's now in my 10.2.8 machine, and I just copied 58 gigs of files to it. It's working just fine. It talks to Server Admin just as it should too.
This server went down for about 20 hours last week due to a spontaneiously bad SCSI cable, I just didn't want to take it out again by doing something the box warned me I shouldn't expect to work....