Hey @jarrett-schweim!
It sounds like this is going to need a little code. When the lightbox is opened, you’ll need to pass a little bit of data to the lightbox (the member that the review is for). When the form is submitted, you’ll need to save the member being reviewed.
Then when the page loads, you’ll need to filter the reviews so if the current member page is the same as the member reviewed in the database, it’ll filter to only show them.
Here’s a starting point 
- Connecting an item to a dynamic lightbox