I don't know why your comment was downvoted. This is good advice. The candidate has the most power in the hiring process between the moment they have received

I don't know why your comment was downvoted. This is good advice. The candidate has the most power in the hiring process between the moment they have received an offer and before they have given a decision. The company at that point has invested a lot of time and money into the process and you are their number 1 choice. This would be the best time to ask any "iffy" questions or to push back on any of the points they brought up which you had issues with.