No...don't think that makes much sense. Insiders would have made a whopping 15% on their trade, provided they bought OSK at it's absolute lowest (not likely). For a stock that is still 25% below its 52-week high even AFTER the contract, I doubt insider activity has much to do with it. There were some insider acquisitions on August 17, but they all seem like nickel and dime quantities.
I suspect it has more to do with the expected challenge to the contract (which Lockheed fulfilled today) and the overall sentiment against defense contractors. If the contract is upheld and starts showing up on balance sheets, then I expect we'll see a slow climb.