Now they are collecting their intelligence gathering buoys.... when they think they have enough data and have analysed the military strength and locations of everyone and thing in the bubble..... GAME OVER MAN!
What military strength? The few shots taken against their backs as they moved away had absolutely no effect on their shields; if their intention is invasion two of their ships should suffice- giving them time for shift breaks.
This is, to my mind, another indication that these particular aliens have no hostile intent; they even seem to be refilling the fuel tanks of ships they interdict