Megumi is still a fairly new songstress...
she looks pretty, I think she sings quite well...as for the dance...I would assume that the company thinks Megumi still needs Ranka's popularity so maybe that's why she would perform a Ranka dance once in a while
And since the movie date is approaching, I think Megumi's performance in the next couple of months will be related with Ranka anyway, and depends on how well Ranka will do in the movie...Megumi will be tied with Ranka for the near future
I think Megumi has potential to have a good singing career...only time will tell of course, but so far, I think she starts her career well