One of the interesting suggestions Rosenberg has made is that this Jewish community may have come from Israel rather than Judah, although that would depend on date of the Jewish mercenaries heading into Egypt if one accepts Josiah 'reformed' the religious practices around 522 BC.
The idea that this could be aping the shape of a tabernacle rather than the temple at Jerusalem (which, from its written description, itself seems to copy even earlier Caananite temple forms) is also a fascinating one. Much of the Old Testament's 'history' has to be analysed through the filter of not only the postexilic community but also by the attempts to hammer the various stories/histories into a narrative which fitted a 'reformed' Judaism.