Keystone masteries in Spectate mode

When spectating a game, I noticed that there is no way to find out what Keystone Mastery a player is using. With the exception of watching him or her apply thunderlords or gain fervor stacks, there is no display that indicates what Keystone Mastery he or she is using. Adding a Keystone icon could help with getting additional information about each player's play style while spectating a game.

Personally, I believe a good location to place a Keystone icon would be in the red area of the attached image: http://imgur.com/7vdCRva

Thank you for your consideration.