Here’s a look back at Week 13’s action, and fantasy advice for the week ahead: WEEK 13 RECAPBills 24, Patriots 10: The gap between James Cook and Devin Singletary has narrowed. In the last three games, the rookie has produced 209 total yards compared to Singletary’s 228 on 13 fewer touches. Pro Football Focus also has Cook graded higher than the veteran in rushing, receiving and pass-blocking this season. Steelers 19, Falcons 16: Diontae Johnson is the first wide receiver in over a decade to get over 100 targets without scoring a touchdown. Packers 28, Bears 19: Justin Fields last seven starts…