The dip is easily explained. They have to keep acquiring companies to show rising revenue to justify the current P/E. When they actually launch DroneBox, the earnings will disappoint and then all the projections will make it clear that this was just a way for the founders of these companies to cash out. Their inability to compete in the market 1-2 years from now is showing.
Why would a company the size of Fatshark not buy RedCat, if the future is so bright? Why would LuGus Studio, who are in the video games business (>$100bn market) sell to a niche drone services company (< $1bn market). It really doesn't take a genius to figure this one out ...