So during a rewatch of Lars' Head, I noticed you can clearly tell that Steven is still freaked out about what had happened, both from his expressions and the way he speaks. (he even states it himself he's freaked out)

Also, look here

He's just standing there. I'm pretty sure it's the fact that the only way he got home was because Lars died.

He's smiling, but he's still clearly sad. (it's a sad smile)

His laugh though, just something about that laugh gets to me. It shows he's happy, but it also shows he's gone through a lot if that makes sense. (just the way his laugh sounds. I've never heard it sound like that before)

Okay, so now onto the point in trying to make.

Even though Steven revived Lars, the fact he saw someone die is really going to mess him up. He's already going through enough as it is, he's carrying the weight of an entire war on his shoulders for fucks sake! (forgive my language)

I really hope that the fact he saw Lars die gets addressed later in the show. It's really going to mess him up, and I do hope that the Gems, Greg, and / or Connie are concerned for Steven once they find out what happened.

Like, this kid is depressed already. Please give him a break and a million hugs.