The last leg of September is here, and a new pattern is emerging that could lead to one of the most explosive quarters we've ever seen.Q4 has always been a powerful stretch for certain names — especially large-cap leaders, tech stocks, and retailers that benefit from holiday spending cycles.And this year, the setup is even stronger. But here's the thing: not every stock and exchange-traded fund (ETF) will rally.This isn't a rising-tide-lifts-all-boats kind of rally. It's selective.Matt Maley's Strategy for ...