Is there some redundancy or overlap going on with the feats and powers here? I've been building an Unchained scare-barian myself, but now I've run into an issue. I'm using the Invulnerable Rager archetype, so I don't need survival feats or powers. Intimidating Prowess and Power Attack were the obvious choices, and the scaling AC bonus from Beast Totem is ideal for a tank character.
Anyway, now I'm not entirely sure why someone would want to have both Intimidating Glare and Dazzling Display.
The STR bonus to demoralize from Intimidating Glare can't stack with the STR bonus from Intimidating Prowess, so the rage power just removes my Charisma bonus from my demoralize check (this is good if your Charisma is below 10). Also, the duration-of-the-rage benefit doesn't apply to Dazzling Display anyway. If you dazzle display first, then your enemies will already be Shaken by the time you hit them, making Intimidating Glare kind of pointless. So you take Weapon Focus, Dazzling Display, and work towards Greater Beast Totem. A seemingly viable strategy would be to area-demoralize, then charge/pounce the toughest enemy who isn't shaken.
On the other hand, the ability to keep enemies Shaken for the duration of the rage only applies to those who were demoralized when they were adjacent to you. Dazzling Display triggers AOO and is better against crowds. If this is the case, it would make much more sense to go with Intimidating Glare and Cleave - this means that you can hit 2 enemies and demoralize them both for the duration of the rage. Also, skipping Dazzling Display basically opens up 2 feats, so you could fit Cornugon Smash or something as another feat.
Am I missing something here? What sort of strategy would require taking both?