Is this just component from 281 cameras or it is computed in one project? How does it look in 3D view? Do you have created two components in 1Ds view?
When you are using GPS data from the images, the scale will be approximate, not precise. It depends on the precision of used drone.
In your work do you need to have georeferenced data or it is enough to have the right scale? If just scale, then set No in mentioned Use camera priors for georeferencing and align all cameras. Then you can apply a scale to your model.
If there is a good overlap between components it should merge without CPs. But yes, the images without GCP info will be added to georeferenced ones. Also you can set for the images from the georeferenced components as Lock pose for continue.