Yes, go ahead.
It is a bad practice to write answers in comments. It's discouraged. Many users fail to understand the difference between a comment and an answer. Some think comments are for answers without citations. Some are lazy to write an answer due to their own reasons. You can use answers posted in comments, add some references to back up, expand it to a detailed answer. This really helps the answered stats. If you are just reproducing them, add attribution to author of the comment. If you are using information, then rephrase it in your own words.
Example: Hamsa Sandesha - a real incident or a fictional work?, my answer and comment underneath the question. I have answered some questions which are answered in comments and flagged the comment as "It's No longer needed". Flags were also approved.
Note of caution: As you do not have enough reputation to look at deleted answers, here is only thing you can miss. Sometimes moderators convert answers to comments. So, there could be a chance of posting the same deleted answer again. Hence, add your information found through research and add it to the answer comment.