The Challenge of Implementing a Battle Pass on a Life Game?

A lot of games have implemented battle busses afterwards. Even a game that i worked at, mosseagans, they implemented a that. It's harder to put a barrel pass on a game that it's not life, because you don't have previous data. And its be more trickier to know what was the bas line wit with the calase gamei feel it tha,  the e dificulty is lower, i think, because you can use the previous base line to set a targetn and so on.