Coutinho, Sterling, & Agger all had higher gopds than Suarez last year

The winner of 'goals on pitch difference' for Liverpool last season was Coutinho with Sterling and Agger coming up 2nd and 3rd respectively.  Similar to +/- that is used in basketball, gopd measures the amount of goals a team scored against amount allowed while that player is on the pitch.  Here are the results for relevant LFC players from last season:

	mins	pp90	ga	gap90	gs	gsp90	diff
Coutinho	2323	25.8	37	1.43	78	3.02	1.59
Sterling	2220	24.7	31	1.26	69	2.80	1.54
Agger	1421	15.8	18	1.14	42	2.66	1.52
Suarez	2962	32.9	47	1.43	96	2.92	1.49
Sturridge	2267	25.2	31	1.23	68	2.70	1.47
Johnson	2515	27.9	38	1.36	79	2.83	1.47
Henderson	3129	34.8	42	1.21	93	2.67	1.47
Allen	1443	16.0	21	1.31	44	2.75	1.44
Skrtel	3221	35.8	50	1.40	99	2.77	1.37
Gerrard	2895	32.2	44	1.37	86	2.67	1.30
Flanagan	1890	21.0	38	1.81	63	3.00	1.19
Lucas	1896	21.1	27	1.28	49	2.32	1.04
Toure	1443	16.0	20	1.25	36	2.25	1.00
Sakho	1478	16.4	25	1.52	38	2.32	0.79

The gopd average for Liverpool was 1.33 per match, which does not bode well for Gerrard and anyone else below him on the table.  Flanagan is particularly dreadful being his 3 goal scored per 90 is second highest, but his 1.81 goals allowed is worst.  I'm at a loss for words when it comes to Sakho, maybe he just isn't that good, and if you would have asked me last week if selling Lucas was a good idea, I would have said absolutely not, but now I'm beginning to wonder if he's no longer of much value.

I'm not surprised by any of the players in the top five except for maybe Agger, who we should truly not sell, but Johnson at sixth is perplexing.  I figured he'd be much worse.  Maybe we should hold on to him for a little bit longer.

By the way, of all players who played at least 1000 league minutes last season, Aly Cissokho had the highest goal scored per 90 at 3.05 and highest gopd at 1.73. Go figure.