Hello LAK, and welcome to the Fourm:
The only way you could properly fix the crack is to dig down to the footer, tear the concrete blocks out and relay them, etc. etc.
No, I would not worry about the cracked wall and the new drain you are putting in will eliminate the small amout of water leaking in. Oh, if you want to finish the basement, you could caulk the crack and paint the wall with Dry-Lok or a similar product.
That pool builder was not on his first trip around the block, was he?