The Stunticons records were wiped remember? Cyclonus is on the Council, so perhaps he either ordered them to Earth or simply manipulated them into taking the opportunity. Cyclonus ought to know just how much of a threat the Bee Team will be so maybe he wanted to do what he could to keep them busy. And perhaps Soundwave is involved, considering he used that distraction to get those Decepticon Hunters. And maybe Megatronus could come into play again as another piece the puzzle, with the true orchestrator being Unicron. Because if Cybertron and Earth were simultaneously destroyed, he would be safe in the indestructible AllSpark shell. And then his minions could free him and he could get back to business bringing doom and chaos to your local cosmos.