The output of the BA Spatial Overlay tool is a new feature class. If you are using the data outside of ArcGIS (i.e. viewing the raw DBF data in Excel) this limits the analysis to 255 attribute fields (the column limit of DBF files). So, if you are interested in more than 255 attributes, you have to perform multiple overlays. If we could output the spatial overlay into a raw data file (e.g. csv) then we could bypass the current 255 attribute limit.