As part of a comprehensive remodeling project in my backyard, I'm releveling the area where there is grass (the drainage was all wrong - the whole yard emptied into my garage) and replacing the old grass with new. I've sprayed the current turf with round-up several times, and it is well and truly dead. Two questions for the next steps:

1. In order to relevel, I will need to till the current soil. Do I need to remove the dead grass first, or would it be enough to just rotatill it into the soil?

2. There is a small area that is in fairly deep shade, but for aesthetic reasons I would like to keep as grass. The rest of the grass will receive a good amount of sun (say 6 hours). I'm pretty well decided on trying ShadowTurf for the shaded area, but want to blend to another grass in the non-shady area. What would blend well and otherwise be good in Oklahoma? I could stick with Texas Tech's Turffalo, but I've read it needs lots and lots of sun and I'm not sure how long it stays green. ShadowTurf was developed from zoysia, so how about empire? jamur? meyer? Or would it be too strange to go to a bermuda like yukon?