Steve: In some cases, if it switched over to ESPN/2 Then it would not be on ESPN+.
For example UFC 242 in September will have early prelims on +, then "normal" prelims on ESPN/2, then Main card on ESPN+ (if you order the PPV, which you can do at a discounted rate through ESPN+ apparently). For non PPV nights though, It seems as if the entire card will be ESPN+, like the UFC Fight Night shows. Examples found in this link...
Bob: I'm a newcomer, in the sense, that I don't post much, but I've been with the group since it started. I think I started on Sue Trowbridge's Late Night Lineup list back in 1994 or 1995 while in college, and made the move over to the TV list because of AB and through the steps until we got to here. I'm betting I have less than 10 posts in 25 years.
Doug: The one nice thing, I enjoy about ESPN+ is that they do have all the 30 for 30 documentaries available to watch.