I'm crazy and that's it.

And then I remember this scene from echoes of the past

And I have a few theories/thoughts of how they're related

At first we thought that those were titan trappers but after king's tide the collector said that he wanted to play with king but king's dad lock him away and hid king from (him?) So that means that the picture we saw in king's tower were actually king's dad but also after what kikimora said of what the collector is I thought of few things

In the first pic where I put red circles we can see

1. A shooting star

2. A creature that looks like the galaxy

3. King's dad

So here's a few things I came up with

1. King's dad is fighting the collector in his true form and the shooting star represents his powers

2. King's dad is fighting a celestial creature that could possibly be related to the collector and the shooting star is the collector being made or sent to fight the titan

3. They're an entire species/creatures/beings/entities (let's call them the celestial entities) that were probably a threat to all the living beings in all realms so all the titans clashed with them and both wiped out each other (and both left a kid behind) hence all the titans skeletons we see in the edge of the world

I dont know why but I think poland is a father figure for ukraine