rhizek

She surely did, but the fight beetwen Starlight (a unicorn) and Twilight (an alicorn) revealed that alicorns possess the same magic stamina as unicorns. That is weird. Studying is one thing, but magic stamina is something different. If magic was only studying the fight between Twilight (wielding all the alicorn magic) and Tirek had been pointless.

That's making the whole thing even stranger and far more complicated Both princess Luna and princess Celestia may be more powerful than Twilight is (e.g. they have the power to move the sun and the moon). But keep in mind that neither princess Celestia nor princess Luna was able to defeat Discord. Actually, even Celestia fighting along with Luna couldn't have done it unless they'd possessed the elements of harmony. Hence, we know for sure that Discord is more powerful than Luna + Celestia. We also know the magic of four princesses (when Twilight wielded it) was able to withstand Tirek. Considering the above we can assume that the magic of all of the Equestria ponies (not including alicorns) is at least as strong as the magic of Cadence + Twilight. Of course we may say it's not true since we don't know how the magic, in general, manifests during the fight. But that may only be true only in case of Tirek. Twilight when wielding the magic of the other princesses was pretty good at direct using it during the fight. I believe it's fair to say that the show has some weaknesses that cannot be explained rationally.

I believe that making Starlight Glimmer as powerful as Twilight is something strange. We saw Twilight fighting Tirek in the 4th season final. At that moment Tirek had the magic power of almost all of Equestria (except the magic of alicorns). The magic of four alicorns(!!!) was able to withstand the magic of Tirek - we saw the even match against Tirek when Twilight wielded the power of all four princesses. I think that Twilight's magic is similar to power of other princesses. We should also keep in mind that Twilight represents the element of magic! In Twilight's Kingdom episode, when Twilight was afraid of taking on the magic of other princesses, princess Cadance said: "If there is anypony who can do this, it's you."