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 Flinty wrote:
I disagree. The point behind the Grey Knights is to combat daemons. As is pointed out at length in the Cain books amongst others, the most effective way to combat daemons is by blocking their link to the warp, rather than trying to fight fire with fire.

The original compilation text doesn’t go so far as to mention blanks, but it’s pretty clear that not all GKs are psykers. The squad as a gestalt is, but not necessarily each individual.

3rd edition Daemonhunters Codex:
"Its recruits are emergent psykers"
"The Grey Knights are screened to exclude all but the most potent psykers"

5th edition Grey Knights Codex:
"To this end, each Grey Knight is an accomplished psyker"

7th edition Grey Knights Codex:
"To combat Daemonkind all Grey Knights are trained to bend the powers of the Warp to their will, and each one is a powerful psyker."

8th edition Grey Knights Codex:
"To this end, each Grey Knight is an accomplished psyker"

9th edition Grey Knights Codex:
"Every Grey Knight is a psyker"

10th edition Grey Knights Codex:
"Every last aspirant who does endure to take up the knightly mantle is a psychically empowered daemon-hunting champion"

Any ambiguity in any of those statements? A single iota of wiggle room to sneak in a cheeky blank? No.
Every single codex they've had for the past twenty-two years has explicitly said Every. Single. Grey. Knight. Is. A. Psyker.

Fair points all

It’s fascinating to see how the descriptions escalate between editions