That was a load of shit and just the writers continuing to wank off unicorns.
Really now, an all-unicorn team should by all logic be at a major disadvantage — earth ponies are much stronger than others, and the butterfly wing spell looks like it wouldn't offer the same maneuverability as a physically fit pegasus.
That whole episode can go straight to hell
Agreed, Rainbow Dash's behavior had to have been one of the worst cases of character assassination ever.
Now this comic here, I genuinely hope they expand on it. Or at least give us some more Scootaloo/Rumble shenanigans
The way she was involved in that one made it look like the writer was trying to say "We'd LOVE
to have Scootaloo partake of the painfully obvious solution to finally get flying, but we're still subject to the show's status quo". Plus the "retail incentive" cover for issue 96 shows Scootaloo in a hang glider flying alongside Rainbow Dash. So hopefully the fine folks at IDW plan to eventually treat that issue with the respect it deserves.