What makes you say that? I only wonder because I would have never made that connection, and I'm interested to understand how you came to that conclusion. After all, Daisy and Peach look nothing like either of the Earth ponies to me, though I do see the connection between Rainbow Dash and Sonic.
I just watched the first 4 Season 7 episodes. I thought All Bottled Up and Rock Solid Friendship were pretty good but Celestial Advice had too much exposition and Flurry of Emotions was too close to Baby Cakes for me. Will continue my thoughts.