Jason, sorry for the delay.
As of right now, the plan is for the drop-shot par three (which occurred after the current No. 13) to be restored as the new No. 14 (you may have noticed the bare minimum version of this green still exists). The current No. 14 (not an original Ross, but would be renovated to better match) will be bumped back to No. 15 so, yes, back-to-back par threes.
In the corridor where Hurdzan's Nos. 15, 16 and 17 currently sit, only two holes would exist. One would be a downhill par four in the corridor current occupied by No. 15, and the next would be an uphill par five in the corridor currently filled by Nos. 16 and 17. The latter hole intrigues me most due to the severe nature of the current slope, but I also understand that Hanse will have a relatively free hand in updating the topography to make this feasible.
The current No. 18 will remain the closing hole.
Hanse was actually at Denison recently as part of an effort to drum up support for the reno-resto. The university does not have quite all the funds necessary to greenlight the project (and its clubhouse component) but the formal event is at least a nice nod that they are trying. There is, however, a master plan in existence. Looks nice.
Denison fka Granville - had heard rumors of a Hanse restoration but could never confirm that
What do we know about what the master plan would mean for the 4 non-original holes?
As an Ohioan myself, I agree with your Manakiki call since I'd generally assume a true Granville restoration is an impossibility. Manakiki could be a real jewel with a little effort.