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The immediate future for the Atlanta Falcons offensive line looks bright.........
If a NFL Team has a good Offensive Line, who does that benefit for Fantasy Points, QBs, RBs or WRs?
All of the above - except for DSTs.
But a good O-Line can refer to two different types:
good for rushing: the offensive linemen can maneuver the defensive ones into positions where the RB carrying the ball has either: a gap to run through; space outside the linemen.
good for protecting the QB: protecting the QB gives the WRs time to run their routes and get into space. A good offence tries to provide the QB with multiple pass options = short, middle and deep, If the QB isn't protected he has the option of a dump-off short. If he's protected he and the WR might be given the time to connect on a deep throw.
In the first case, the obvious beneficiary is the RB.
In the second case, it is the QB and WR and, at times, the TE. [The TE often ends up blocking.]
Not all O-lines are good at both. Although that depends as much on the coaching as it does on the attributes of the linemen.
If a team tends to run the ball, the defence doesn't often rush the QB as that can open up gaps for a RB to exploit. They place most of the defenders in the box to block the run.
If a team tends to pass the ball, the defence tends to adopt a dual approach: rush the QB in an attempt to either sack him or force a hasty throw; have their safeties/CBs/linebackers guarding the offence's pass cachers - not just the WRs but also the TEs and pass-catching RBs.
Of course, it's not that simple.
The best offences do one of two things:
excel at rushing or passing and dare the defences to do their best to stop them. e.g. Tennessee with Derek Henry; Tampa Bay with Brady
set up their offence pre-snap in such a way that either a rush or pass play is possible and the defence is confused as to which is planned. e.g. New England during a lot of Bellichick's reign; any team with a good dual-threat RB.
The phrase "play-option" refers to such a set-up where the QB has the choice between handing the ball to a RB or keeping it for a pass.
The best defences try something similar:
set up for rush/pass plays and dare the offence to go ahead. [Of course, that presumes they are correct in what the offence will do.]
set up the defence in such a way that the offence doesn't know what's coming. e.g. will they rush the QB? will they block the run? Belichick is renown for confusing offences with his defensice set-ups. Experienced QBs aren't necessarily confused but rookie QBs? Belichick's record against first-year QBs is something like 29-6.