Definitely Morgan or Mo.
Does anyone recall USA Basketball coach Katie Meier's comments re: Morgan at one of their practices?
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For Meier, she had the pleasure of coaching Tuck last summer with the USA U18 National Team and was instantly amazed at the 6’2” forward’s intellect. She provided an example of how she ran a play where Tuck discovered something that needed to be changed based strictly off instinct.
“I stopped practice,” Meier explained, “and said, ‘Tuck what did you just do?’ She’s like, ‘Well I saw the curl and I read it and popped.’ I was like, ‘I’d been running that play 20 years Morgan, and I’ve never had someone show me that wrinkle.”’
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Mo is surely an excellent student of the game as well, and has soaked up an awful lot under Geno, Shea & Co. at the PG spot.
Another point in Morgan's favor is that her footwork is fabulous. Footwork is not God-given. Players with that kind of footwork are players that are constantly READING the floor, what's there, what's not, where the defender's body is in relation to the basket, where it isn't, where the help is, etc., and then taking maximum advantage. Moreover, footwork of Morgan's quality does not arrive overnight. She has been reading the floor that way for years, refining it. Reading the floor with that kind of keen eye for years and years allows you to soak up bball knowledge that manifests itself in other ways, not just the feet.
Morgan's combination of footwork and floor recognition are, together, the best of any UCONN player I have ever seen. I only started watching in earnest in 2008 so YMMV. Sue Bird as a senior (unfair to use the current, professional Birdie as a comparison) would certainly rank very high on the 'basketball knowledge' scale as well.