Betts stands in the goal square or pocket hoping for cheapies over the top. Which is fine, but that's not defensive pressure. Compare him to Rioli/Poppy and you'll see what we mean about defensive pressure. Sure, his ability 1v1 is quite good, but how many times does he get forward 50 turnovers? Not much.
Contested possies, yes. Hard ball gets, yes. Freakish goals, yes. Effective tackles? Not so much.
No question about Rioli and Poppy - but you don't watch many Crows games based on this post! There is a reason many defenders panic in our forward line when in possession.