Penix almost threw for 5000 yards the year they played in the title game. JM threw for less than 3000 this year.
I don't know what the low or high end would be in passing yardage if, say TS, wins the job this year, but I'd be shocked if it is not way north of 3000!
This actually provides an interesting commentary on Sheridan's career because he had Penix for two years as well. Penix has injury issues but it was about the same number of games as he had Milroe. Furthermore, Penix had starts the year before Sheridan was OC and he performed better, so his subdued production wasn't just a product of Indiana's shortcomings (their QB was great this past season by the way).
Anyway...
Under Sheridan here's the numbers
Penix: 11 games, 2,584 passing yards, 18 passing TDs, 11 INTs
Milroe: 13 games, 2844 passing yards, 16 passing TDs, 11 INTs
It's actually remarkable how similar the production of both of those guys ended up being in Sheridan's offense. Anyway, my point is I'm much more comfortable with the notion of Grubb unlocking a QB's potential than I was with the previous play caller...
Here's what Penix did in Washington immediately after his time with Sheridan:
Penix: 13 games,
4641 passing yards, 31 passing TDs, 8 INTs
Even his interceptions went down.
We can do Milroe as well, here's what he did under Rees:
13 games, 2834 passing yards, 23 passing TDs, 6 INTs
Weird how the trends all went one way... but it somehow had nothing to do with the OC.