Here is my take. If you were to rank our offense from last year --- taking into consideration only conference games and the Bowl game (doing so, so as to assess only against the better competition) --- and you are ranking on a scale of 1 -10, with 1 being as bad as is possible, 10 being as good as possible and 5 being an average major-conference-level offense --- then I'd place last years offense as a 2.5 on a 10-point scale. Now... I'd expect that with this new year coming up --- a healthy QB, more experience, simpler schemes, and better blocking assignments --- that the NU offense could be much better than last year --- perhaps a 4 on a scale of 10 (almost an average D1 major-conference level offense). Limit the fumbles and penalties, lower the sacks needlessly taken... and maybe NU is a 5.5 or 6 on a scale of 10.
So... improvement? Almost certainly. Improvement into a "good" offense (a 6.5-7.0 on a scale of 10)... not likely. But we could have an average (to slightly better than average) offense (which would be a great improvement over last year, where, frankly, NU was pathetic in conference and in the bowl). If so... we can compete reasonably well in the B10. Win a division? Likely no... but compete and win more than we lose (in conference)? Yes.
Let's take a look:
K State: 9
Texas: 1
Okie State: 9
Mizzou: 7
Iowa State: 3
Kansas: 3
A&M: 1
Colorado: 5
Oklahoma: 3
Washington: 1
I add that up and get a 4.2 (42/10). Now, notice that pre-Martinez injury (italicized dates) is an average of 6.5, and post-Martinez injury is an average of 2.67, using my very sophisticated numerical assessment of every game. Now, anyone who's followed my posts (don't you all?) would know that I don't lay all the blame for our late-season offensive woes on Martinez's glass ankle, but there is no question it had an impact. To compromise, let's say that without Martinez's injury, our offense would have maintained at least a solid 5.5 average for the year.
If you take that 5.5 and add the 1.5 you are crediting us with from the changes to the scheme and coaching staff, you are looking at ~7 on a 10 point scale assuming Martinez stays healthy. I think that's about right: If Martinez stays healthy and we see some significant, but modest, improvements in our offensive scheming/play calling/fundamentals, I think we can have an above-average to good offense.
Of course, the real question is what will the improved offense do to Rex's numbers. Well, it looks more and more likely that Rex, rather than one of the new guys, is going to be the feature back in our system, which will have an increased effect on his carries. Last year, Rex got 951 yards on 172 carries for almost exactly 5.5 yards a pop. Now one has to address how many more carries Rex will get now that he is the feature back.
To answer that, I would point out that Rex and Roy had 360 combined carries last year, which is about 25 per game. With our shift to a run-first offense, I would expect us to run the ball at least as much next year, and probably more. And as our only back with any real experience, I would expect Rex to get the bulk of our HB carries. I will split the difference and say that Rex will carry at least 19 times per game next year. At last year's rate of 5.5 yards per carry, that comes out to 1,436 yards assuming a 14-game season (or 1,358 yards assuming we miss the BigTen CCG).
But note that this is using last year's rate and is therefore not giving Rex the benefit of any improvements in blocking, play calling, and having other playmakers on the field that the D has to account for. (For example, much of those 5.5 yards last year came with Rex running against a stacked box out of the Wildcat where it was obvious he was going to tote the rock, or with no Martinez on the field. In fact, Rex's two highest production games---Iowa State and Colorado---came without the benefit of Martinez on the field.) Nor is this giving recognition to probably the most important factor of all: Rex's own individual improvement from last year.
I would not be surprised, then, if Rex flirted with a yards-per-carry rating of somewhere around 5.8 or even 6.0 next year, depending on how well our offense is humming. Now, if he totes 19 times a game at 6.0 yards per carry, you are looking at just under 1,600 yards in a 14-game season, or just under 1,500 yards by the time Heisman voting will occur. Assuming that he will also make contributions as a receiver, he could have around 1,800 all-purpose yards.
Is it enough to win the Heisman? Probably not, but if our offense improves slightly, Martinez stays healthy, and Rex stays healthy, I think there is a good chance he'll at least be in the conversation.