Jan Dewald: I think it might be because after w blocks with C2 and b connects with E2, there is the angle tesuji at B2, making D2 a more severe option.
Ivan Detkov: C2 after D2 right away is bad. We better check what ajis are there and it seems that D2 is leaving more ajis.
C2 after D2 right away is bad. We better check what ajis are there and it seems that D2 is leaving more ajis.