So, just to confirm I've got this right, if I want to get some vorax and thallax in to help muh muhreens: I take an allied detachment and a commander to unlock two auxiliary detachments if it's a magos, and this leaves me with no units he can reasonably join, so I need to take another commander to unlock more units who can't be retinues (scyllax, echidnax) or elites (domitar, myrmidon) because those aren't available to allies, so mech allies actually basically have to take castellax/thanatar and are outright locked out of domitar (despite previously being literally a Legion choice)?