Some one confirm this please, I have some doubt although it does seem highly plausible.. My friend told me that the R188's will permanently be coupled with each other in the sets they are because if one goes of the 5 or 6 car set goes out of service , The other will have to go out of service also. Ill explain better by giving an example
7811-7821 Is running and car #7820 has malfunctioning brakes. It is taken out of service and taken into the yard. Since 7820 is part of the 6 car set, the other 7811-7815 will just remain in the yard till the other part of it gets fixed and coupled back. Since its 5-6 car set, There would be no point of coupling the working 5 car set to another one since all of the 5 car sets will need a 6 car set.
I tried to explain to him that I dont think it woudl really matter once the Corona yard is 100% NTT. But then doesn't seem to far fetched.