Mr. Dee, you are looking at some interesting data but drawing the wrong conclusion.
Positional upside is built in to prospect evaluation.
Over the last 36 years you note there have been just 4 #1 pick point gaurds. Thats 1/9 rather than the expected 1/5.
The positional upside you argue for is already built into prospect evaluation.
Since we are only talking about guys who led their teams to titles, the only players in the last 36 years to fit your criteria are the following.
Magic Johnson
Hakeem Olajuwon
Larry Bird
Michael Jordan
Shaq
Tim Duncan
Lebron James
Isaiah Thomas
Kobe Bryant
we will throw thomas out because he did not carry his team, he was only the best player.
Magic--> no-brainer #1 pick
Olajuwon --> #1
Larry Bird --> acquired through auerbach trickeration probably would have gone 1/2 next to Magic --> #1
Shaq --> No-brainer #1
Timmy --> no-brainer #1
Lebron --> obvious #1
Isaiah Thomas #2, point gaurd*
Kobe Bryant--> went 13th no one saw him coming.
*didnt carry team to rings. Was only best player.
So the only time ever, a player like this has not been seen as the obvious #1, was Michael Jordan. He was picked after 2 centers.
This shows that positional upside is built into prospect evaluations.
Lets look at the recent point gaurds:
In 2015 Deangelo Russell went second behind no-brainer #1 center Karl Towns. It was fairly controversial that he was taken ahead of Jahlil Okafor. The move now looks brilliant.
In 2011 Kyrie went #1 overall. The other "elite" prospects? Derrick Williams and Enes Kanter. Advantage Kyrie.
2010 John Wall goes #1, the next two: Evan Turner and Derrick Favors. Advantage John Wall
2008 Derrick Rose goes #1 in an actually fairly controversial decision. They guy he battled it out with: Michael Beasley: advantage Rose
Going deeper in 2005 Deron Williams was selected 3rd behind a Center (Bogut) and a Forward (Marvin Williams). Harder to judge, Williams the obvious bad pick here. Bogut won more and he was a center so he was given a positional boost in the draft. Likely part of the reason he went ahead of Deron.
If a point gaurd is the #1 guy in this draft it is likely that he is the clear cut better prospect. If there is a generational talent in this draft he will distance himself from point gaurds like Fultz and Ball.
Hard to conclude that a guy is a generational talent, especially from PG position. More often than not, almost every best player in the draft is not a PG. You only take a talented PGs if the other talented high upside options are out. Its the same reason Danny went with Brown, instead of any of Murray, Hield and Dunn.
Over the last 37 years, here's the best player in every draft:
1980 - Kevin McHale PF
1981 - Isiah Thomas PG
1982 - Dominique Wilkins SF
1983 - Ralph Sampson C
1984 - Michael Jordan SG/SF
1985 - Karl Malone PF
1986 - Dennis Rodman PF
1987 - David Robinson C
1988 - Mitch Richmond SG
1989 - Shawn Kemp PF/C
1990 - Gary Payton PG
1991 - Dikembe Mutombo C
1992 - Shaquille O'neal C
1993 - Chris Webber PF/C
1994 - Jason Kidd PG
1995 - Kevin Garnett PF
1996 - Kobe Bryant SG/SF
1997 - Tim Duncan PF
1998 - Dirk Nowitzki PF
1999 - very blur line
2000 - Kenyon Martin PF
2001 - Pau Gasol PF/C
2002 - Yao Ming C
2003 - Lebron James SF
2004 - Dwight Howard
2005 - Chris Paul PG
2006 - Lamarcus Aldridge PF
2007 - Kevin Durant SF
2008 - Russell Westbrook PG
2009 - Steph Curry PG
2010 - Paul George SF
2011 - Kawhi Leonard SF
2012 - Anthony Davis PF/C
2013 - Giannis Antentokuonpo SF
2014 - Joel Embiid C
2015 - Karl Anthony Towns C
2016 - Too early
In 36 years, only 6 draft class have PG as their best talent. While wings have 10, Bigs have 19. Logically we would like to get a big as a priority. But if there is no talented bigs available, go for the next higher upside position. PG is only a last resort if the pool of talented wing and bigs are poor.
Case of 2011 draft. Kyrie went #1 overall. Is he a bust? No. But can he carry the load alone? No. You can't say the same with Leonard who went 15th overall in the same draft. Not only Kawhi fills the in-demand needs, but he also went to become the best player of that class and now the franchise player of the Spurs. It's also the same reason Danny went with Brown.
In 2014, Danny missed out the chance to grab any of Wiggins, Parker and Embiid. He even offer the treasure vault just to have a chance to get Embiid. Drafting a PG is not a problem if let's say there's only one of Smart, IT and Rozier are in the roster. Its easier to develop talent that way. However, we have a log jam at that position that we have to immediately ship one of them if Danny is to draft guards who can only play at 1 spot. And Danny doesn't like giving away talent for cheap. He'd rather cut them than lose on some low ball offers. Not trading them immediately would only cost player development and might also cause some locker room problems and assets value decline, as already evident with the logjam of Sixers roster.
I wouldn't go as far as Okafor>Russell just yet. They have identical weaknesses on their game. I will agree that he's better than Winslow or Johnson though, but Porzingis is better than Russell so far.
If other teams than Sixers drafted Okafor instead, he will have better numbers as his rookie season suggest.