How does this not exist yet???
There is a small (very small) part of me that thinks Ritz will be better off long term if he has another mediocre to poor showing and therefore decides to go completely back to 5k/10k. Maybe his body will hold up better there.
But I like Ritz, and I know he really wants to do well in the marathon so I am rooting for him. As for a prediction ... it's a good deep field and he may get in over his head and blow up, but I think he runs smart enough to run a very solid new PR of about 2:07:37.