My thoughts on pro/am status:
1. Timing. After looking at their team, it seems Pro status encompasses more than strictly results. JP and Tanner obviously. As for Jacob and Phil, they've stuck with Armada for a while. Am team - Hornbeck, Torin, and now Henrik have each been on the team no longer than approximately 2 years (hornbeck joined summer '09?) It seems based on how they operate, rocketing someone straight to pro status upon joining the team would require a very justifiable explanation.
2. Politics? Not so sure on this, but having a tiered team like this may have the potential of pissing people off? Obviously Gus has top notch results, and sticking with the brand for a few more years will likely place him on the Pro team....... it's hard to immediately place most athletes up there on the Pro team ahead of these Ams who obviously kill it hard.