Hi,
Network synchronization will help decreasing the C/I, especially in case of SFH 1×1 or 1×3. The point here is to increase the capacity of the network (better C/I means the network can actually accept more traffic before soft blocking)
It will not allow neighbours with same BCCH ! That would be a magic trick.
co-BCCH neighbours are still forbidden.
Cheers,
Pix