Thing is, we now have some comparable results that help us assess where the schools stand. Cranbrook lost to St Augustine's; Knox beat St Augustine's relatively comfortably: it's hard to see that this makes Cranbrook a better side than Knox. Cranbrook beat St Patrick's 17-5; Barker beat them 36-14. It's hard to see how this makes Cranbrook a better side than Barker. Knox and Barker have had very tough trials against GPS opponents, during which they had some significant wins: Cranbrook had a soft outing against Kinross.
Same goes for St Aloysius. A 26-25 win over St Pius is great, but Trinity beat St Pius 17-12 after leading 17-0 with a few minutes to go, so that result doesn't make St Aloysius an obviously better side than Trinity, let alone Waverley and Cranbrook.
It's nice to say, "my school can win" or "my school can come third" but back it up with some facts!