Aggregating multiple rasters using model builder

[mllobera]

This is  a follow up on my previous post Averaging Multiple Hillshades 

Is it possible within model builder to aggregate rasters that are produced on the fly, i.e. by some iterating process? Say, we simply wanted to add rasters that are being produced from the iteration.

What would be the recommended way of doing this? 

Do we need to generate these previously on disk and then aggregate this? How would we do this in model builder?

Thanks

[DanPatterson]

If by aggregate, you mean add overlapping rasters, then

Cell Statistics (Spatial Analyst)—ArcGIS Pro | Documentation

with the sum option

[mllobera]

This is not what I was asking

[mllobera]

So I take from the silence, that this is not actually possible just using the model builder????
I know this can be done using Python. I am teaching some geoprocessing and I wanted to keep it all within the scope of the model builder. Again, if anyone knows a way of doing this within model builder I am sure my students will appreciate it.