I'm not sure if you've ever seen Plotniy play, but beating him 6-3 6-1 and then beating the talentless Davydenko doesn't equate to doing a fantastic job. Kimmer has great potential, but I am not reading anything into these matches.
Cagnina's results are much more impressive.
What does Cagnina have to do with this?
You can only beat who is in front of you, and to reach quarter-finals and semi-finals at futures level at the very, very early stages of one's career, regardless of the opposition, is really the most that one can ask them do.