Probably typical FW not having a clue. I'd have thought it would be in reference to things like Rites of War being able to reference 'Dreadnought Talons', as in 'Dreadnought Talons may take Dreadnought Drop Pods in a 1:1 ratio as dedicated transports; if one Dreadnought has a Dedicated Transport, all must take one.' Each talon (including dedicated transports) is considered a single unit for the purposes of Deployment, Drop Pod Assault and when rolling for reserves.'
But of course, that doesn't work, as Deredeo, C-Mortis, and maybe Leviathan's are not included within that, nor does combining the unit when deploying via something like a Non Dedicated Transports like Thunderhawks etc.
There is no rule that allows you to take Multiple Dreads in drops in a single FOC orhave I misread your post?