No. If Shannon Byrnes plays in a premiership team this year (yes, I said "if", not putting it "in the bag") then your argument would hold true.
Selwood could actually win the Brownlow this year. Ablett does not poll well because umps have long memories, and Ablett was a habitual whinger to umpires up until 2007 (and before everyone vents on that, this is the exact reason why Wayne Carey never won a Brownlow). Jimmy B could poll well, but his disposal has been below par this year, whilst Selwood has been superb week in week out.
If you've seen both Cotchin and Selwood every game this year, I'll bow to your greater knowledge... but I've seen every game Selwood's played, and more than 1/2 of Cotchin's... and Selwood has him covered... totally
You're right in the sense that Selwood has be to good enough in his first two seasons to play in both Grand Finals, which is definately true, but actually having 2 GF medals doesn't make him better than Cotchin, and Richmond haven't had the chance to have him in a GF(and probably won't), but it doesn't make sense to say one's better than the other because of it.