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I personally had no problem following along. It was very clear that Vander and Silco had a falling out. They didn’t tell us exactly what happened, but like you said, you don’t need everything spelled out for you, right? The impression I got was that Silco wanted to go a radical route while Vander didn’t.

Not sure what there is to explain about a time jump.

They actually did tell us why Vi was sent to prison. Marcus was supposed to kill her but he didn’t want to. So he locked her up and threw away the key instead. This was all spelled out in the show.

Which characters did you feel needed more backstory?

The Vander-Silco falling out might be what we see at the very first scene in S1, namely, Silco wanted to go on an all-out war against Piltover, while Vander did not. The horrible consequences shown are exactly what was driving Vander to take revenge for all the lives lost, and why he felt obligated to get Powder and Vi under his wings.

I mean there could be something else, since it is not specified, but I think it would fit the timeframes nicely, and for the writers, there is no reason to think up something else - especially now that both V and S are dead... So I think it is implied that it is that, but we'll never know for sure. I see a really small chance this will be explored further in S2, provided no one alive can tell the tale.