If Salyeris, Ruhktanshi and Flaaayin aren't on the pillar, somebody (i.e. Graatch) make the case for why Susu should be.

In other words, in what ways is Susu's "resume" stronger than those characters' resumes. I'll start it off w/ some stats:

Total hours, hours spent as leader, total PKs, total mage PKs, mage kill %, PKpH for each:
Susu: 588 hours, 100 hours, 189, 96, 50.8%, 0.3214
Salyeris: 990 hours, 693 hours, 252, 141, 56.0%, 0.2545
Ruhktanshi: 721 hours, 329 hours, 181, 86, 47.5%, 0.2510
Flaaayin: 620 hours, 427 hours, 156, 85, 54.5%, 0.2516

Here's what I see in terms of objective "stats":

Susu has the best PKpH by far.
Susu comes in last in hours spent as leader by a long shot.
Susu comes in last (by a nose) in total hours (behind Flaaayin).
Susu comes in second to last in mage kill percentage (behind Flaaayin).
Salyeris wins hands down in total PKs, total hours and hours spent as leader. Salyers is also tops in mage kill percentage, with Flaaayin close behind.

Reading the immortal comments for all four, both Salyeris and Ruhktanshi got some criticism, as did Susu. Flaaayin's immortal comments were universally positive.

I'm tempted to say that if Salyeris (for raw stats) and Flaaayin (for super-positive imm impression and pretty good stats) aren't on the pillar, then Graatch's complaint about Susu's absence isn't really justified.