The only difference is that those runners ran WR pace for the first half of their race, not 2:13 pace. So of course he was going to have blazing speed in the bag.
There is nothing to think about with this slow a s s race. Hell, look at what they covered in Berlin in the first half of that race running at 20 seconds above record pace at one point.
They basically ran a 1 hour 40 min warm up, and then ran a 10k in Chicago
Don't dismiss so easily the difficulty of picking up the pace off a slow tempo. Many runners find it easier to sustain a hard pace than to change gears like Rupp had to do. It's all about rhythm.