I dont understand that answer
So let me rephrase the question. Can i jump up to teir 2. T3, and t4 as long as i beat the capstones , without beating the whole story and lillith?
You can go to tier 2 at any point. But you can't run the capstone to unlock tier 3 until you've either beaten or skipped the campaign. Assuming you've already beaten the campaign on another character, you can skip the campaign at any point, even if you play like half of it, and decide you want to do something else.