I think the problem with Kearns and probably Martin is they have a day job and anything they say is just off the top of their head. No time to research or think about it. Whereas Kafe has obviously taken some time to put together his piece. Not sure if Cannon and Horan are in the same category but maybe someone could help me out there.
A bigger problem is that both Kearns and Martin apparently think that they are genuinely amusing. They are not.
For a former Wallaby captain, Kearns appears to know remarkably little about the game. It took him years before he could say anything vaguely informative about the scrums, which is truly amazing, and an indictment of whoever put him on the show, and keeps him there.
The biggest single difference is that Australian commentators do not understand what a commentator should do. First, let the pictures tell the story, secondly, explain what the average viewer might not understand or see properly because of the distance/angle etc, and thirdly interpret and explain tactics and strategies. Do not fill the silence with incessant chatter, less is more when it comes to good commentatory.
Tell us a bit more about the background of new Australian players, particularly older players who have just appeared on the scene at this level.
Do not tell us what is going to happen next. When it happens, we will all see it, and in the meantime you are usually wrong. Greg Martin in particular is always calling the next move, and he invariably gets it wrong. The definition of insanity..........
Finally, take the time to watch games commentated by the better British and New Zealand commentators. You might learn something worth learning.