Grand Crusader explain

Grand Crusader procs on avoiding an attack.
Please define avoid. Is It dodge, parry, block, any of them, some of them, more than just those?

Dodge, parry, miss, hammer of the righteous, blessed hammer (cast).

Just to confirm, are you saying that Block…pretty much the central ability for the entire class / spec…, does not proc Grand Crusader? And if so, what stat would you recommend stacking to get more Grand Crusader procs?

Correct.
I wouldn’t stack any stat for something as specific as gc. Your stats should be chosen with the whole spec in mind. ilvl>haste>rest for survival, sim for dps.

Crit is the only secondary stat you can stack to increase GC proc rate, as it increases your Parry chance.

With that said, Doyouneedbro is right; that’s a terrible idea.

(Haste also for the hotr/bh casts)