Class One.
The question: why speak of Yetzias Mitzrayim after Moshiach comes, since that redemption will be much higher?
Answer One: Because there is some similarity, as both are connected to revealing the 50 gates of Bina (but not on the same levels).
Answer two: Because all Geulos -freedom- begins with Yetzias Mitzrayim and it gives the power to all Geulos that will follow.
Class Two
Answer Three: Yetzias Mitzrayim was Iskafia and the final Geulah is Ishapcha, there will remain an advantage in Iskafia even when Ishapcha predominates.