I looked through several of my old seasons. I'm pretty sure top vision for D2 is right around 100.00. I had 99.78, 100.05, and 99.67 seasons all with 0 OOV recruited by others. Then I had a 98.78 with 13 OOV recruited by others and a 98.72 with 22 OOV recruited by others.
I did some other messing around and I'm pretty sure of the following:
Pure D3 OL range from about 50.0 to 75.0, so I think the lowest D3 vision should be around 75.0
Pure D2 OL range from about 75.0 to 91.5, so I think the lowest D2 vision should be around 91.5
Pure D1AA OL range from about 91.5 to 112.5, so I think the lowest D1AA vision should be around 112.5