Sorry, but no, certainly not the best UK career. Issel's UK career stats are heavier than Davis. Davis himself would agree with that. Nothing that happens in the NBA can ever change that.
You seem not to understand the context of Dan Issel's stats. Yes, they are incredibly impressive, but there are some HUGE mitigating factors surrounding them. Issel played in the highest scoring era of college basketball history, and he played on one of the highest scoring teams of that era. It was also an era when it was not uncommon for a coach to force-feed his best player, getting him a ton of shots. That's why you had Maravich going for 44 a game, Austin Carr putting up over 38 per game one year, and numerous other guys (Calvin Murphy, Elvin Hayes, John Mengelt, Johnny Neumann, and more) putting up statistics that would look completely absurd in the 2011-12 version of college basketball. If you want to go by sheer statistical volume, you'll come to the conclusion that all the best players in college basketball history played from approximately the mid 50's through the late 70's. Which somehow doesn't seem possible.
You need context. It's like comparing these 2 stat lines for baseball players:
player 1- .319 BA/ .362 OB/.589 SLG/44 home runs, 146 RBI's
player 2- .290 BA/.390 OB/.547 SLG/37 HR's, 119 RBI's
Player 1 looks better on paper. But in this case, player 1 was Vinnie Castilla, a 3rd baseman for the Rockies who put those numbers up in 1998, playing in a year when the average National League team scored 4.6 runs per game, and playing in a home ballpark that wildly inflated scoring. Castilla finished 11th in the MVP voting that year
Player 2 was Mike Schmidt in 1986, playing in a year when the average National League team scored 4.18 runs per game, and in a home ballpark that was relatively unfriendly to hitters. He won the MVP that year.
Anthony Davis played on a UK team that averaged 77.4 ppg, in games where UK and its opponents combined to take an average of 115.7 FG attempts, and 38.8 FT's. Issel's senior year, he played on a UK team that averaged 96.8 ppg, in games where UK and its opponents combined to take an average of 146.5 FG attempts, and 50.9 FT's.
Think about how that effects stats. Just take rebounding as an obvious example. In Issel's senior year, the average UK game featured 90.2 rebounds. Issel averaged 13.2, and was responsible for 14.6 % of all the rebounds in UK's games. Anthony Davis "only" averaged 10.4 rebounds. But the games he played in featured an average of 70.9 rebounds, and he was responsible for almost exactly the same percentage as Issel (actually, a tiny bit more). And think about AD's shotblocking. He personally blocked nearly 8% of the opposition's FG attempts. That means that around 1 in every 13 shots the other team attempted were rejected by Anthony Davis.
There was a reason that AD won POY, and it didn't have much to do with his pro potential. It had to do with what he accomplished on the court, in the context of the year he was playing in. Issel's accomplishments in his era were obviously great, and he was, if not POY, close to it. But you can't just point at some numbers that are bigger and say that wins the argument.