Keenan Allen, DJ Moore a dynamic duo like no other

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Keenan Allen caught 108 passes for 1,243 yards and seven touchdowns last season. When Justin Fields made his first NFL start in 2021 — an ill-fated game against the Browns in Cleveland in Week 3 of his rookie season — his wide receivers were Allen Robinson, Darnell Mooney, Marquise Goodwin and Damiere Byrd.

His tight ends were Cole Kmet in his second NFL season, Jimmy Graham — past his prime in his 12th season at 34 — and Jesse James.

His offensive line was anchored by 39-year-old left tackle Jason Peters — who still had it in his 17th season — but also journeyman Germain Ifedi at right tackle.

And his play-caller was head coach Matt Nagy, who was in a futile struggle to escape…