So for Ryzel it is really a very good thing to marry someone he still knew even though they married at the last minute.
For a mental lock to be said to be successfully established a symbol of each other's quantum beast would appear on their bodies. Before the appearance of the symbols the guide and the sentinels needed to continuously engage with each other for a higher resonance and a faster establishment of the mental lock.
Establishing an imprint on each other's mental sea is very easy for sentinels and guides who have a high matching rate but it would take a long time for their symbols to materialize which Ryzel finally understood.
Materializing the symbols of each other's quantum beast needs their mental power to be fused together with each other's bodies. That's why it would take longer for those who have a higher matching rate because the ones they would need to fill would be larger.