you know how they get better powers every series well in the new bloomix series how thy loose there powers why don't they just use there old powers instead of blooms?????????????

I think winx club tried to successfully tie back season 6 back to season 1 where bloom "loses" her power, also that once a fairy have reached a higher form they can't go back one transformation. It seems the dragon flame created hybrids of each power. I think that it was a little too under explained, I thought each fairy drew their power from a specific source. As I said before the dragon flame provided a hybrid power source for the five fairies