Question that nobody has a great answer for: Presence of the Krogan in Andromeda

Krogans are too useful as wepons and would surely help with this expedition. The fact that there are only 4 arks doesn't mean there's no more than 4 races at in the expedition. We don't know how many krogans we have within it but it's clear to me that we won't see many krogans, so i'd say they are there more as mercenaries and there's this female krogan which has a superintendant position in the initiative. Krogans are not there to stablish a colony of their own IMO, so there's no need for them to even think in reproducing and genophage stuff. They could eventually do it one way or the other, or simply go into stasis and go back to MW.