Cleon
Legend
Let's just keep both. I'm pretty happy with it as is.
The original monster's is AC 6, which is 2 worse than the Armor Class we've currently got.
Hold on, no it's three worse - the Dire Raven has inherited a -1 size penalty the Executioner's Raven shouldn't have!, meaning its AC should be 17, not 16. Presumably that's an unwanted residue of a Large sized predecessor.
So, how about cutting the NA bonus for the Dire Raven?
Dex 17, NA +2, AC 16 (+4 Dex, +2 natural)
Shade'll also need to fix the Executioner's Raven, I'd rather remove the size penalty and increase the AC as follows:
Armor Class: 17 (+4 Dex, +3 natural), touch 14, flat-footed 13