First of all, phenomenal performance. 44.42 is some running.
But 44.42 means he's now good enough to be contending to make U.S. teams (last year, he went out in the semis at USAs). If he makes the world team next year or the Olympics in 2020, is that going to be an issue? I think it could be as it seems as if double amputees do have an advantage when it comes to the 400.