I didn't miss it either, I just don't believe a big bike is germane to 'endurance' riding. With everyday, off-the-shelf components, even a 'race' frame can be set up comfortably.
i also don't believe larger frames confer any ride benefits, just penalties in terms of responsiveness and weight. Comfort can be tuned more effectively via components than frame, and a solid, efficient frame is always the preferable base from which to proceed in my mind.
As a rule, it's always possible to go up/out for fitting, but you run into frame limitations coming down/in. I don't think that's an issue here between 56 and 58cm sizes for this rider, though.