one CR - lack of overlap

Dear All, hope my topic hasn't sunk, is there anyone who can help me?

Here is a short stimulus:

Every member of the football team is required to attend this week’s practice, despite the fact that some members of the team are not eligible to play in the next game. From this information one can safely conclude that at least one member will quit the team prior to the next game.

I excerpted the solution from BIBLE:
Fails on two counts: it lacks the concept of the overlapping majority ,and the conclusion drawn is clearly not justified by the premises presented.

My doubt :
1) Every member is required to attend, that means all need to attend, and some menbers of the team are not eligible to play. obviously, there is overlap. The overlap is some,
2) why the conclusion is not justified by the premise, I think there is no gap.

I have no idea about my misunderstanding,

Anyone here can help me??

Thanks a lot.

Have a nice day.
^_^