Huge myth.
The 01 team was healthy when it got its butt kicked in South Bend.
01 had a great collection of talent; it was not the best UConn team.
You are certainly right that Sveta and Shea were both able to play in the ND game which we lost by 15 points.
However, if I remember right Shea was not the same player her senior year that she had been. If memory serves, I remember being at the TN game in Hartford (the one right after a big blizzard) and being shocked at Shea's complete inability to elevate (think Stef Dolson). So I think injuries may have played somewhat of a role.
I think you're right though that it's almost impossible to argue that the 2001 team was the best ever in light of the losses to ND. (As an aside though I have to say that ND team was awfully, awfully good. Better than a run of the mill NCAA champion.)
At the same time, when I look on paper at who the Huskies had on the roster in 2001, it's hard to argue that it didn't have the most talent. I mean, Sveta, Shea, Sue, Dee, Swin on one team!! Not to mention Asja and Tamika.
Best team and most talent are two very different things of course.