Those who have a guide are more likely to be able to contribute more because they wouldn't be affected by the Zergs who are emitting something that causes a sentinel's mania.
Sentinels with a mental lock can stay on the battlefield longer than others.
The federation made the guides marry early so they could establish a mental lock with a sentinel.
The performance of sentinels who have mental locks can be said to be five times more than what they usually do without a mental lock.
Aside from their responsibility to give birth to more guides and sentinels.
The primary responsibility of a guide as a marriage partner was to establish a mental lock for their partners for their protection.
If it wasn't already proven that a guide can only establish a mental lock with only one sentinel, Ryzel was sure that the marriage system would be different.