This is my OL is MFN-73. I went from 1-15 (only Banta, a converted TE, at LT) to 8-8 (added Rookie C and RT) and now going into Year 3 have added the LG and RG (Rookies).
Now note that I went from 1-15 to 8-8... and those guys were Rookies so their Block Ratings are no where near the Projected Max. Also note my Offense carried me as my Defense is a train wreck.
LT A Banta Year 3 (27, 6'1" 280) 76/77
SPD 74 ACC 74 STR 99 RUN 72/75 PASS 84/86
LG J Lester Rookie (22, 6'5" 309) 38/91
SPD 99 ACC 86 STR 87 RUN 33/87 PASS 25/100
OC K Cox Year 2 (23, 6'2" 285) 92/98
SPD 100 ACC 100 STR 100 RUN 68/100 PASS 81/100 SS 100 LS 57
RG M Moss Rookie (22, 6'2" 313) 41/90
SPD 74 ACC 80 STR 91 RUN 25/88 PASS 24/94
RT G Perdue Year 2 (23, 6'5" 320) 86/95
SPD 92 ACC 100 STR 96 RUN 79/94 PASS 59/94
Now I pass (literally) on about 80% of my Plays. So teams know what is coming. Yet I went from 1-15 with just Banta at LT, to 8-8 by adding a Rookie C and RT who finished the Season being really good but spent most of the Season getting those Skills up. Perdue is still only a 59 Pass Blocker, and Cox is an 81 which is good but not yet great.
So how did we net +7 Wins? I can only assume the QB I brought in, and Cox/Perdue/Banta keeping him alive.
My Rookies won't be very good early on, but the guys they replaced weren't very good. But they WILL become pretty darn amazing at those Guard spots.
I'm sure you saw a Theme. I converted Banta because he has some Speed and TE Weight, to try to keep up with the Smaller, Faster DE. All my guys have Speed, it's the one area I'm disappointed in Moss at. They all have ACC. They pretty much all have STR. In other words I have some pretty Extreme Athletes who are 280+ and can Pass Block.
They make my Team, without them I don't make the leap in just 1 Season that I did.
And yes, that's Four 1st Round Picks on my OL, in only 3 Seasons (all Drafted in the last 2 Drafts). I value them that highly.