Was it just coincidence that we played so much better in the second half when Frazer came on as he seemed to have shored up the right hand side and Clyne seemed to really flourish on the left and didn't feel the need to try and hit 50m passes up to Rickie
It wasn't as simple as 1 player playing better than the one he replaced. Clyne and Puncheon do the same thing and get in each others way on the right.
Clyne on the left didn't have the same problem because Adam is much more free and spontaneous than Puncheon which meant Clyne then could join in the fun making the usual Lallana/Lambert double act into a threesome
Richardson doesn't cut in like Clyne so he wasn't tripping over Puncheon.
So the change made several players games improve because it improved the system as a whole.