Last season we beat Brighton at home with 2 goals from Van Dijk, which doesn't tell the whole story of what happened yesterday but goes some way to showing the fine and fat margins of difference from losing someone like Van Dijk.
We are going to be an extremely up and down team for the rest of the season, unless we have just as good luck with injuries after Jota returns as we've had bad luck in the first half of the season. We cannot afford for Jota, Mane, and Salah to miss another run of games, without them our entire team changes and how we can be contained becomes dramatically easier. It wouldn't be so bad if we also weren't missing our Van Dijk, Gomez, Matip, and Fabinho, but we are, so losing 1-0 at home to Brighton isn't an expected or inevitable result, but in the context it is an understandable one.