IMO, this bunching up of men (single file formation) is part of CQB drill and not exactly to be followed when you're exposed in open terrain. The pics have been taken in an open area for optics purpose. Again, IMO, it serves no purpose in open area.
If in open ground - they will be moving with Ballistic Shields. - Plenty of Pics of NSG with them already - Newly inducted Kit.
If RPG's and Heavy Guns in Play then NSG will either NOT be the primary Response Unit or Will move in close to the Structure with Armoured Sherpa's (again in Inventory)
First & third are good photo ops but bunched up without cover is asking for trouble, unless its a very momentary pause during sprint that the camera happened to capture.
This is a Photo Op for the Annual NSG Calender
NSG can be expected to be the best in CQB, because that is their primary line of work.
CQB is a perishable skill. Urban CQB is 90% of what NSG practices - where other SOF units will be practicing it less as compared to other fieldcraft. And their CQB orientation is easily visible in their Kit.
However Where NSG TRUELY comes into its own is in Hostage Rescue.
Lastly - If you see recent pictures of NSG SAG cadre you will notice that a higher % (than before) are carrying Balidan and SG badges on their uniforms. A wealth of Talent and experience is slowly accumulating within SAG ranks that will further increase their capability.
Like this gent for example