How do I ensure fair performance ratings in the stack ranking system? is on hold as primarily opinion-based. If it were a question about the ranking system itself I might agree, but this question asks how a manager can fairly rank his employees given the requirement to rank them relative to each other. That's a common problem, and answers would be valuable to have.
The OP speculates about some factors he could use, but I don't read this as an "is that good?" question. I read it as the OP showing his work, showing the ideas he's already considering. Answers would be free to address them, dismiss them, or utterly ignore them.
I don't see any comments suggesting improvements or requesting clarification, hence this meta question. Why is this closed and how would it need to change to be reopened?