Use of BAMs mapped to assembly of all reads in metagenome binning.

Question

[robert.murphy]

The binning tool CONCOCT requires mapped reads from several samples to the assembly of all reads. I understand the need for read depth in the binning process, but why only on random samples and not all?

See here for the guide saying they are needed: https://concoct.readthedocs.io/en/latest/usage.html