Strange puzzle pieces

If you create a timeline involving radio transmissions from the downed Prometheus expediton back to SOL. Zeta Reticuli is 38.6 LY's from Earth. If the first updates from the expedition reached Weyland corp 40 years later, versus the return of the expedition (If Prometheus can only travel at C) then the first order of business would be to investigate the site of the crash and recover any confidential materials, and or data discovered by them. Remember that life continued back here over the course of their journey. Weyland merged with Yutani. The Nostromo's crew had never seen anything like the derelict before. Unfortunately that wasn't true for the exec's that signed their paychecks.