Not a mistake, but Kraken is definitely a creature you might prefer to attack with than to guard with.
I find [mwcard=DNC18]Togorah, Forest Sentinel[/mwcard] difficult to play partly for the same reason. He has Vigilance/Intercept, which makes you assume he must be a terrific guard... but doesn't get to counterstrike. At least the Vigilance allows him to attack and get a guard marker in the same round, but it still feels hollow when your guard doesn't get to counterstrike.