I posted this in the Greenskin forum but it applies to any mastery path really.
Please keep in mind for your mastery paths that you must purchase the Tactics and Abilities with mastery points.
Example 1 - 15 points in Brawler, no Tactics or Abilities purchased.
Example 2 - 17 points in Brawler, all 3 Tactics purchased, No Abilities.
Example 3 - 17 points in Brawler, all 3 Abilities purchased, No Tactics.
Just wanted to clear up what appeared to be confusion on how the Mastery Paths work.