You'll warrant? What evidence do you have to support such a claim?
What you have to remember is that a set increase from 4 to 5 coaches is only one part of the overall increase.
Just taking a two hour period around Cheltenham this morning, there are three diagrams that are 2x4 (on the NE/SW corridor), four that are a 5 car set, and only 1 that is a 4 car set. Switching a 5 car diagram to a 2x4 car diagram will result in a big increase in capacity, and releases a 5 car set to strengthen a previous 4 car set diagram, which then releases another 4 car set to help double up another diagram. From my bedroom window (between Bristol and Taunton) I see many more double sets now than I did before.
We know that XC is talking to the govt to try and get the remaining 221s - somehow I am doubtful they will succeed in loosening the purse strings, but the fact is that there has been a significant increase in capacity which should be welcomed, even if we would all like more.