Dosen't the captain have a tommy gun like the lieutenant? In that case wouldn't it be better to reserve zooks solely for RE as they are crap anti-infantry anyways, and then turn the Captain into a solid anti-infantry units.
He does, but his squad has 2 RE models in it, unlike the LT who just has 4 RMs and then himself. And if you give him double zooks and get him to vet 3 then the passive sprint out of combat makes him really useful as an AT squad.
REs are still great for zooks though, but if you end up going captain then I would still keep him as a zook squad. I feel zook REs are more a part of LT play since better to use the muni on bars for your riflemen if you can just get an AT gun from your Cpt tier.