Along with joining Aouita as sole members of the sub-1:44/su-27:40 club, I think Webb is also the only American male to be top-10 in the 800 and 10,000 at the same time. Of course, the much-reviled (on this board) Mary Slaney held American records for both at the same day, as well everything in-between.
Other U.S. women have probably been top-ten in that kind of range of events, though maybe not at once. Francie Larrieu comes to mind ... maybe 2:00 earlier in career, then very high up on 10k and marathon lists.
I haven't looked ... is Webb top 10 in 3k? I know he is in 800, 1500, mile, 2M, 5k, 10k ... hasn't run 2k or 1k that I'm aware of.