Considering Gideon's speech about taking the best elements from Mandalorian society, perhaps this is where he got the idea, to use the legend of Mandalore's greatest hero against them.

Source: https://screenrant.com/moff-gideon-clones-force-grogu-blood-the-mandalorian/

Gideon's hunt for Grogu led Din to meet the child in the first place.

Source: https://collider.com/the-mandalorian-best-supporting-characters/

The fact that Gideon's armor was beskar was an insult in and of itself.

Source: https://www.cbr.com/moff-gideon-beskar-mandalorian-darth-maul/

The upbeat David Rossi (Robert Dunne) replaces him: In many ways, he's Gideon's opposite.

Source: https://www.slashfilm.com/1160104/every-season-of-criminal-minds-ranked-worst-to-best/