This is not a significant amount of miniaturization. This may not be a predictor of future loss at this stage. On the other hand, it may be an indication of very very early hair loss. If you cannot see it, that is a good sign.
It seems you have a concern of doing work and experiencing loss subsequent to the surgery. This happens, no doubt. It is good concern to have. When we look prospective patients we try to assess the potential for future lose and the corresponding risk associated with whatever plan the patient and the doctor come to. For example, many times we see 26 or 27-years-old with isolated frontal tufts and peach fuzz through their crown areas. There future is clear; at some point in the future they will be a class 6 or a class 7. If they understand this, have limited goals, and have the good donor recourses we consider treating them with a timeless hairline and an overall design that will enable future loss to happen gracefully. We leave the door open for future work but do not commit the patient to this. In other words we treat the patient as if he was already a class 6 or 7.
You are older than the patient in the example above with significantly less ominous signs of dramatic future loss. I suspect you will lose more hair, but not to the level we fear for in the young patient. But, like the young patient, it will be better to give you a timeless hairline and an overall design that is aligned with you worst case scenario for loss. This way we leave the door open to stop or go in the future.
If you come in again, we will have the doc look at your crown and give his opinion. There is no crystal ball though. That is why meds and topicals are crucial, particularly with other therapies in the pipeline.
As Dr. Cole says, if you are concerned about loosing hair in an area â€œthrow everything at it but the kitchen sinkâ€ before surgery is needed.