D5 and K9 are related?
Could be Superhero and Sidekick for all I know.
Random thoughts:
Delta D to K = 7
Delta 5 to 9 = 4
74 could be year 1974
https://en.wikipedia.org/wiki/1974
74 could be month and day = July 4th
https://en.wikipedia.org/wiki/July_4
74 could be Letter Number, as in G4
https://en.wikipedia.org/wiki/G4
D = 5th letter. 5th month = May
K = 11th letter. 11th month = Nov
D5 shows number 5
K9 shows number 9
5 x 9 = 45 = POTUS DJT