Yes. When Evan Lysacek sadly had to withdraw from 2013 Skate America, USFS made good use of the host pick vacancy, giving a U.S. skater the opportunity to make his Grand Prix debut there.
The skater's name was Jason Brown. He placed second in the short program.
If/if/if Jason were to decide to withdraw from 2026 Skate America (not my wish), I hope/believe that USFS would give a U.S. skater the opportunity to fill the vacancy.
(My guess would be that Jason intends at this point to keep his 2026 GP assignments, but if he were to change his mind later, I hope that he would feel free to do whatever makes him happy.)
I think non-U.S. federations inviting skaters to their GPs would be scrutinizing ISU SB and ISU WS lists.
Not really placements at U.S. Nationals -- which I'm guessing is where your comment is coming from?
I don't see how Kapeikis and Kazanecki were "skipped ... to get to Ma." Canada invited Kapeikis, China invited Kazanecki, France invited Ma. One invitation for each.
My point of view is that Martynov and Kovar also were not skipped. They are below Ma on the ISU SB list. Also below Ma on the ISU WS list (as are Kapeikis and Kazanecki too).