Nelson, Teg, Solinsky, Rupp, Curtis all have the A-standard (LAST Payton Jordan counts for 10k only). Those five are only ones with chance to make Worlds unless someone else finishes in the top 3 and runs 27:45 because there are no qualifying races between USATFs and Worlds. So anyone wanting to go better run A-standard pace to give themselves a chance.
The other distance races will allow for those in the top 4 at USA's to "chase" up until August 8th.