Actual post-shower thought. Yknow those dpxdc hcs that Danny can eat Kryptonite?
What if that is the sole reason the Kryptonians start to fear Phantom? Like, little guy could be seen as an ancient apex predator of the Kryptonians from long ago before Krypton became more civilized.
He can eat his weakness! LIKE CANDIES!
Since the kid can be seen through different times in history (CW with his little errand boi what can I say?) there are images or mentions of him in the fortress, although very vague ones so they assumed that this fella is a baby tamed version of the real deal.
Or maybe not add the time travel bit and the JL is just jumping on the train of "Holy Canolli this kid's ancestors maybe used to hunt down Kryptonians and fueled themselves by ingesting Kryptonite".
Idk it would be fun to see Hal or Diana messing with the supes or just Superman with Danny like:
