I think there are a ton of variables that come into play with the throw in mow, throw and spray, spray and throw etc. The amount of thatch that covers the seed is a big one for me. Where I had nice layers of WR straw, I had great germination and plants are going well, except for where the soil was uneven and the roller wasn't able to press the seed into the ground. These areas didn't take off as well.
Where I sprayed 3-4 foot tall grass, waited a week and then sprayed again and spread seed, the plot looks great. I had plenty of dyeing grass to help cover the seed and keep the turkeys, black birds and others at bay long enough for it to germinate.
Now I did a spread, mow, spray and roll in a wooded plot that had a ton of thatch. It was probably 1-2 inches thick in places. I will be curious to see how this one turns out. I am a bit worried the mowing covered up some of the weeds and the gly wasn't able to reach it. I am also wondering if the thick layer of dyeing weeds and clover will smother the seed.
I also tried a little 40x40 plot that has some grass, alfalfa, clover growing in. I spread WR and oats and then just rolled it several times. No spraying or mowing. I am real curious to see how that goes.