The must wins are in the knockout phase.
We could win each group game 10-0, but unless we get to the final we are not going to the Olympics.
And the SFs, to qualify for the U-20 World Cup.
But your not getting into any final or anywhere if you underestimate your opponent.
This is not about mathematics. Its establishing a culture. That has been the biggest issue with the usmnt program. They feel entitled to win without playing the game. Then when they lose, they blame the conditions or refs...ect
They need to take care of business. Expectation is for them to win group and qualify to Olympics. Now they have to achieve that.