Bella had not been in the water for long so her features may have been easier to render. The thorough search conducted by LE at the pond and analysis of this little ones remains may give them more details and it may take some time. In Bella's case it took a while before the pollen analysis on the clothing was announced. This little one's body was treated very differently than Bella's, it seems. The location, as ticya aptly pointed out, and placing remains there in horrific condition, may say a lot about whomever placed them, at least that they may be very familiar with this park and be somewhat inhuman. Further speculating that:
This person needed a very private place to dismember this little one after death. They needed time to get the remains there unseen. They needed to know when to do that unseen. They needed a way a cart/car/stroller to get the remains there unnoticed. To leave unnoticed. Maybe to come back unnoticed. Could it have been somebody who did not have access to a vehicle thus chose this place and lives close by? Could it be somebody who frequents the area and would not stand out as a presence? Could it be limitations or just freaky intention or both to that placed this little one there? Most of all was this child meant to be found? Could the person know that the remains had a good chance of being found? I wonder if LE compared visitors to the park as seen on cams going back from just prior to the finding and compare it to the days that followed, would there be any obvious individuals apparent to them?