A good part of the whole idea of Erudites being at least on par with Arties, Wiz's, and CoD's is that they have access to all the same ju-ju the other classes do, and even more opportunity to abuse it through raping the action economy. Even something simple like jacking up ML to allow for Twinned/Repeat/Linked powers and rolled in with Chain/Reach Power for mass buff/blast/debuff all in one action, is usually only possible for the other Tier 1's (artificer I think is the exception, but I'm no expert on them, so I'll leave that to someone else) if they take a PrC (i.e. RKV or War Weaver come to mind immediately). An Erudite can do it right out of the box.
Also, depending on level of cheese, an Erudite can conceivably get every 8th-9th level divine spell as a power, and every 9th level spell, given that they can always research it. Time is the only limiting factor, and given the power level involved by that character level, it's not really a limit at all. Triplecasting with the best augmentation mechanic there is without the risk of your buff (and half your spells, as is the case with a Wizard abusing shapechange to get cleric spells) is exceedingly powerful, and while it mainly only would add versatility to anyone else, the Erudite possesses the full capability of bringing it all to bear at once. And that makes it high Tier 1 (One) at least .
~End Rant~
PS : And hopefully it didn't seem as garbled as it did when I proofread it O.o