Broken it down to the top 6 of the 21 and under bracket... then rated them as unbiased as i possibly could at their current state....
Carlton
Kreuzer 6/10
Gibbs 7/10
Murphy 8/10
Grigg 5/10
Jamison 7/10
Bower 6/10
Total - 39
Collingwood
Cloke 8/10
Thomas 6/10
Pendlebury 8/10
Clarke 5/10
Anthony 5/10
Brown 7/10
Total - 39
Essendon
Ryder 8/10
Neagle 6/10
Gumbleton 3/10
Reimers 6/10
Myers 4/10
Jetta 5/10
Total - 32
So Carlton just, ahead of collingwood and well in front of Essendon
My opinion only
You give Brown a 6/10, yet Jamison a 7/10?? Brown plays on the best opposition forward almost every single week, and more often than not holds his own. Jamison, whilst also a good player, does not take the opposition gun forwards. Brown has played on the likes of Brown, Riewoldt, Roughhead and Franklin just to name a few, holding his own against the mentioned players, albeit Franklin.
For mine, both players should be on even terms, at the very least.
And I respect that you ranked Murphy and Pendlebury the same, although for mine both are 8/10