In a learning path, the course manager can perfectly integrate an assessment. When submitting the assessment in the learning path, students can see the automaticaly generated feedback for each question.
BUT, this doesn't work with an open question. (students can answer the question, but the course manager cannot see the answers)
The course manager has to use a work-around:
publish the assessment with the open question in the assessment tool in the course. Link in your learning path to this assessment.
Then you will be able to view the answers of the students, to give feedback and to rate the answers.
That's how I do it in my course, and it works.
I hope this information is helpful.