I would like to understand the concept or reason why Blue Crystals always give the highest Hero Power rating.

Examples have maxed gear (O6), skills & epic at level 125.

Example #1: Lion Knight: Base HP is 289,162 & Base Damage is 8,451.

Adding a Red Crystal gives a 9.59% damage increase V.S. adding a Blue Crystal that gives a 4.20% HP increase.

A Red Crystal Lion has a Power rating of 18,002 V.S. Blue Crystal Lion has a Power rating of 18,230. The Blue Crystal Lion has 228 more Power rating.

The Red Crystal Lion obviously gives a much larger percentage of stats increase over blue, however a Blue Crystal Lion has 228 more Power rating.

Example #2: Forest Hermit: Base HP 162,008 & Base Damage is 8,461

Adding a Red Crystal gives a 9.58% damage increase V.S. adding a Blue Crystal that gives a 7.51% HP increase.

A Red Crystal Hermit has a hero rating of 12,923 V.S. Blue Crystal Hermit has a Power rating of 13,150

The Red Crystal gives a larger percentage of stats increase over blue, however a Blue Crystal Hermit has 227 more Power rating.

Additionally, when a hero has an AOE attack (Dragon, Pony, Hunter), the Red Crystal produces more parentheses skill damage that affects 5 enemy targets (modified even more by Epics), producing a larger damage output. However, once again, a Blue Crystal gives more Hero Power rating. A Backline AOE attacker benefits much more than a single target attacker, but the Blue Crystal gives more Hero Power rating. A Blue Crystal Hunter has Hero Power rating of 15,143 V.S. Red Crystal Hunter has a Power rating of 14,916 - Blue Crystal Hunter has 227 more Power rating.

Why does the Blue always give more rating?

Maybe someone would like to chime in or explain why they think a Blue Crystal Hero is better. (Swash excluded).