Emeka and Rip are no question on the Mt. Rushmore of Husky greats, which in and of itself is an amazing feat. Mek gets #2 for his sheer domination of the Blue Devils in the 2nd half of the 2004 National Semifinal.
But sorry... there is only one #1... and it has to be Kemba. The 2011 Huskies do not win the National Title if you were to switch Emeka for Kemba. Only Danny Manning's "Danny and the Miracles" run to their title in 1988 is on par with what Kemba Walker did for us in 2011. And although the 11 game "March to the Sea" through the Big East Tournament and the NCAA Tournament would put him neck and neck with anyone, some people tend to forget that Kemba was arguably the best player in the country for the entirety of 2010-2011 (I still will argue with anyone that Jimmer Fredette did not deserve player of the year as he was awful on defense, while Kemba usually played D on the other team's best guard. NO COMPARISON!).
The run in the NCAA tournament never happens without Kemba embracing the leadership role right from pre-season workouts and becoming the man from day one. He lead us right out of the gate to that totally unexpected and totally satisfying win in Maui (I will never forget the absolute spanking we put on Calipari and his heavily favored Kentucky Wildcats in the championship... absolutely top 5 non-NCAA championship games we won during the Calhoun-era).
Kemba is the greatest leader to ever don a UConn uniform... Khalid and Shabazz are right there behind him, for sure, but Kemba has to get the clear nod there as well. His 2010-2011 body of work from beginning to end is still the greatest singular season-long performance that any Husky has ever had. That makes him #1 in my book. Oh, and he also was in a second Final 4... and an important role player as a freshman on that 2008-2009 team.
As a side note - my favorite part of these discussions is going through the exercise of remembering how many great players and special young men we have had play at the University of Connecticut. We are absolutely one of the luckiest if not the luckiest fan base in all of college basketball.