Although I agree with your point, I am not so sure Aminu will get that many minutes at SF. When Stotts was interviewed during game 1 in Vegas, he seemed to indicate that Aminu would be playing PF exclusively. I could have heard that wrong, but was happy to hear him confirm where they would play him most.
But that still only leaves about 48 minutes at SF for Harkless to share with Crabbe and Turner. The best case scenario for him and the Blazers IMO, is for Turner to play about 30 minutes in the back court with either Dame and CJ. (Dame 34, CJ 32, ET 30) and let Harkless and Crabbe divvy up the 48 at SF.
Certain opponents and end of game situation would make Terry deviate from that, but as a general rule it would get them their needed minutes.