Hi,
not sure if i understand the scenario correctly.
If all switches have SVIs in a common /29 subnet and you enable OSPF (non-passive) for that subnet, they should all become neighbors. If you don't enable OSPF on Sw2/Sw3, Sw1 and Sw4 will become neighbors anyway when layer-2 communication is possible end-to-end via the corresponding VLAN.
With the default network type (broadcast), after DR/BDR election every switch will establish an adjacency with the DR and BDR, whereas DROthers among each other won't (2-way state).
In your physical topology the switches are connected in a point-to-point manner, however, a key characteristic of Ethernet is that all stations can communicate directly to each other on the same segement, so logically it acts like a full mesh. The OSPF network types Broadcast and NBMA heavily rely on this capability.
Does that answer your question?
Rolf
