The mane six are the best at what they do:
Close, but not quite.
Twilight is the most powerful spell caster there is,
Confirmed multiple times to be false. She just has the highest potential of any unicorn Celestia has seen.
and a natural leader.
True.
AJ is a farmer with an affinity for plants beyond compare.
Is she? Applebuck Season actually implies that more than half the bucking is done by Big Mac for a start. And we don't have any other evidence supporting her as better at this than other ponies other than her leading the plant team in Winter Wrap Up which is inconclusive.
RD is the fastest flier there is.
No. She
claims to be the fastest
Pegasus in Equestria. Now. It's implied that there have been faster pegasi in the past and that there are faster
non-pegasi.
Rarity is a superb designer.
Superb, but is she the best?
No pony knows animals like Fluttershy.
Are we sure of that? She didn't even head the animal team in Winter Wrap Up. That was Amethyst "Sparkler" Star. Admittedly, that doesn't tell us much, but still.
And pinkie has pinkie powers.
Are we sure these are unique and not simply unusual?
EDIT:
Well, most ponies who figure out their Destiny and get their Cutie Mark tend to stick with what they love and become masters at it anyways :V
Raity was profficient with her talent the instant she got her cutie mark. AB can already renovate dilapidated houses in ridiculously short amounts of time, never mind what happened with Cutie Pox. Pinkie could make her family smile on her first attempt. Twilight was a walking nuke. Rainbow Dash's Sonic Rainboom. Fluttershy can communicate with animals on her first attempt.
edited 28th Feb '13 7:48:31 AM by Sereg