Radiolucency adjacent to implant: thoughts?

This patient is a healthy 30 yr old male who had this implant placed due to congenitally missing left mandibular second bicuspid. The primary tooth was extracted more than 10 years ago. He declined orthodontic treatment prior to implant placement. A Nobel Conical Connection implant was placed surgically with healing abutment for 4 months (first PA). Healing period was uneventful

An impression was taken after 4 months and the tissue was healthy, no inflammation was present and the implant was integrated. An x-ray was taken to confirm seating of the impression coping (second PA) and a small radiolucency was visible on the mesial of the implant body. Comparing this to the x-ray taken at the time of placement there was also some radiolucency at that location at that time as well. Therefore this was determined to be a bone marrow space / trabeculation.

The crown was placed 3 weeks later and an X-ray was also taken that day. Again there is a radiolucency in this area (mesial of implant) which is consistent with the previous x-rays. Again there were no symptoms, no inflammation, and the implant is integrated. The implant crown is protected by good canine guidance and there is absolutely zero contact on excursive movements and there is also shim relief in centric. Because of this the implant will not be subject to excessive occlusion forces. The soft tissue is healthy. I advised that we would monitor this site closely taking a PA in 4-6 months time to check for remodelling. This is my approach at this time.

Is this simply just the bone architecture in this area or are we seeing something more that this?