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Man, I remember someone on twitter saying that this image sums up their friendship perfectly well. Let's talk about that.
On Twitter @specterlobo already stated that Shirakumo pulls Aizawa along while Yamada pushes him from behind, clearly worded in the main manga and vigilantes series.
But like there's also focus. In the Kurogiri arc we see Aizawa focusing more on Oboro and trying to bring him back- or get more information as someone who idolized him and felt extreme guilt for what happened- Aizawa follows Oboro.
Yamada however clearly focused more on Aizawa which went mostly unnoticed (cause Yamada's BEHIND HIM), comforting and defending him as Aizawa continued to put his mind onto- really, the past. Yamada follows Aizawa.
But yknow what?
This dynamic changed. Even if just for a little bit.