there's nothing to worry about
Streelman & Karl dispute the use of the PJA as a character uniting all Labroids. and they might be right. the PJA as a taxonomic basis for this suborder is rather weak.
but then they present an analysis on the basis of only one locus in nuclear DNA (Tmo-4C4). and that yields different results, challenging the monophyly of the suborder.
in my opinion, looking at only one locus is just as doubtful as looking at just one morphological character. scientists have since then based their analyses on more (molecular as well as morphological) characters.
but.... putting all that aside, in all of their phylogenetic trees the Cichlidae appear as a monophyletic group.