The defenders usually look good for cheap on paper and that is it.Why are people playing 4 and 5 defenders at the back?
Take the likes of Shaw, Digne, Reguilon and Chilwell for example, attack minded, good crossers, on set-pieces, might play as wingbacks in what you'd expect to be a tighter Man Utd and Everton defences. Plenty sources for points and looks too good for less than 6.0m.
You stock up on them, allowing you to fund more premiums. The premiums deliver, but then everyone has them too. The good looking defenders return no more than 6 points every week, while the likes of Sarr and Buendia who were similar prices but didn't look quite as good get off to flying starts, scoring braces and double figure returns, and before you can find a way to hop on, you are already around the 2million rank.
There is a reason 343 and 352 are statistically the most successful formations in FPL. The less defenders the better. It is difficult to predict their returns.