I think it's premature to have Prohm in with Dixon. To put in groups, I'd say:
1. Self/Huggy/Drew/Kruger/Dixon
2. Prohm/Beard/Shaka/Boynton- too early on all, but all proved themselves prior to being here and haven't done anything to disprove themselves.
3. Weber- see above
Can't disagree with your logic although I think Self and Huggy are in their own tier. Shaka doesn't get a pass from me for underperforming with such talent though.