It's so inconsistent it's just crazy.
Not a huge Lyon fan but Gary made a really good point that players should be held accountable when opponent has the ball with 3 options.
Bump, Tackle or Smother.
In all actions you have duty of care not to injure the head. Either with a head high bump, sling or dangerous tackle and this would be the rare reckless smother. Another reckless smother would be a well disguised bumping smother which has a head clash or shoulder to head. We've seen a head clash during a bump get suspended eg Fyfe.
So under that theory Maynard should be suspended but alas. Finals tax strikes again.