Questoris Allied Detachment - 30k - Points Irrelevant - Interpretation

[limber patrol]

Okay, I have a question:

If I am building an allied detachment out of the Mechanicum book, is it possible to bring 1 armiger and a squad of secutarii?

Do I have to bring a second armiger to fill the second Troops slot instead?

There is backstory reasons why I want to do this.

[random narwhal]

No those are two different detachments. Secutarii can only be taken in titan maniples and armigers can only be taken in questoris household detachments

Ie, you need a titan to run secutarii, but you can ally in two armigers in a questoris household