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Your definition quite literally makes no sense. Basically we could trade any of our prospects who haven't regressed yet and it would be "selling high" according to you.
Yes, that is exactly the case. When you have a prospect that started out at low value and currently has a much higher value then you need to make a call; if you project that his value may ultimately drop you need to trade that prospect before his value levels off again, if you think your prospect is likely to grow significantly in value or fill an organizational need in the near term you hold onto them. In this case Benning thought that Forsling's value was at a high point and that it was likely to regress back to some mean for the near future, so he moved him. Looking longer term he may not have ultimately reached his absolute peak, but this is a risk you make whenever you trade any player that isn't already in their late 20's.
To use a business example, you have a start up that has grown significantly over a short span but is still at a point where it isn't fully established. Your current valuation is $100,000 and you've been offered a significantly larger and safer asset that is already passed the issues facing your start up but still has solid growth potential ahead of it, the question is do you take it? This is the question Benning faced and ultimately he decided that the offer was fair and sold his start up for a more proven asset.