Thanks for the re-inclusion of the Explorer Mark XXIV.
Ironically enough, given my (and Horizon's) preferences there is nothing extra that needs to be added.
The section on page 6, Tau Special Rules, that says Tau ships use the normal Leadership rules covers it all. The point that the escort squadrons roll their own leadership rolls is a standard rule, rather than getting their parent ship's leadership?
Perhaps a note under leadership that all escort squadrons roll for their own leadership values independent of the parent might be appropriate given the change from earlier versions. For myself leaving the option to keep take the leadership value of the parent ship/squadron, provided only Orcas towed in by that capital ship squadron form the escort squadron, would be nice - having your cake and eating it, as it were.
The section on the Wardens specifically says they throw leadership separately from a parent ship (if that ship has grav hooks for Orcas). Perhaps this special case implies the converse if the grav hook were for Wardens.
Castellans are explicitly able to squadron with Wardens (under some restrictions) so clearly the Wardens are able to squadron outside their parent capital ship squadron Grav hook complement.
Orcas with from a Space City are excluded from forming a squadron with any other escorts. I would remove this restriction. It does not apply to the Wardens that could be assigned to the same Grav Hooks. It does seem a little harsh making the Orca pair Leadership 7, but perhaps that is "fluffy" (second line troops). Opening them up to form a squadron with other escorts should allow them to take on the leadership of the escort group that they join.
The wording on the Dhows implies some restrictions. I think the wording as is implies that Dhows may only form a squadron with other Dhows - although it is not crystal clear.