A few more sentences were added in the “Conclusion” regarding the power and achievement of the 16S rRNA analysis.
Authors shouldn't forget (particularly in conclusion) that the resolution power of 16S for high ranks (genus and above) is currently well accepted. And the number of non-redundant 16S entries available is much much larger than that of archaeal genomes. 16s data offer a much comprehensive view of the archaeal diversity, including deep branches.