The Park Flashback/scene Where Tenko Plays With Mikkun And Tomo-chan In Chapter 418 First Takes Place

The park flashback/scene where Tenko plays with Mikkun and Tomo-chan in Chapter 418 first takes place in early afternoon, as evidenced by the clock reading almost 2:00 PM.

The art in the scene confirms this: clear bright skies, and the shadows under the children are short.

However, the time in the scene changes after Mikkun and Tomo-chan tells Tenko he should be All Might (the moment Tenko decides he wants to be a Hero, as he tells his mom in Chapter 235). Suddenly it's evening: the clock shows 6:13 PM, and the sky darkening because it's nearing sunset.

When Shigaraki/Tenko thinks of the League, he and the League (and Deku) all have long shadows, the kind you see when the sun is low in the sky.

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The context:

Sunset is the time to go home. Children who have been playing outside, in playgrounds, at the park, are supposed to go home, to get back in time for dinner, back to their families.

In Japan, many cities and towns have a bell/chime/song that plays from public loudspeakers at around 5:00 PM. It's a daily test of an emergency broadcast system, but it has also come to be seen as the evening bell, a 'go home' signal, especially for children, telling them to go home before it gets dark.

In manga and anime, all these elements have become common imagery and symbolism, associated with each other: red-orangey colors, sunset, long shadows, the chime, children saying goodbye to their playmates for the day, the idea of home and return.

(from Mushishi)

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Putting it all together:

When the park scene first shows up, it's Tenko memory of playing with Mikkun and Tomo-chan, likely exactly how it had occurred in real life: it's early afternoon, the sun is shining bright, their shadows are short, they're at the park, they're playing Heroes, and when the kids tell Tenko that he should be All Might, Tenko is overjoyed.

But this isn't the scene 15-16 years ago; this is a memory. Tenko is also Shigaraki here. He has just had his core pried open by Deku, and given relief. The Crying Child has been symbolically saved, but the past, the massacre, the Walk still all happened.

So it's suddenly 6:13 PM, it's sunset now, because it's way past proper time (5:00 PM) to go home - because Shigaraki/Tenko can't go home to the Shimura house. It's too late. It's been long over.

Shigaraki/Tenko then looks away from Mikkun and Tomo-chan, to the side, and say, 'Nah' to their suggestion, because besides it being late, he also no longer wants to be All Might. He's deciding he's a Villain, he still holds malice and he still destroys.

So, the scene changes again to contains the League now, all six of them (plus Deku). They exist in this sunset time, hence their long shadows. They exist with current Shigaraki/Tenko, they exist in the now - and arguably, they would be the home he would return to at sunset.

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Up to interpretation, of course, but the sunset/going home context is real.

Japanese tweets about it (translated):

[When Tenko got the words he wanted, his eyes lit up, but it was past time to go home so I'm guessing that means "it's too late."]

[It is just heartening that the League members are the place where Tomura would return to when it was "time to go home." I'm sobbing]

[In the scene where Tenko is at the park, the clock is already past 6:00 PM, the time when good kids go home, so if he had met Deku a little earlier, Deku might have been able to stop him, but this seems to show that they're past that stage now, which is good.]