Even most of the elite point guards and shooting guards do not shoot 45% in three point shots. Examples last year Russell Westbrook 29.9% James Harden 37.5% Kevin Durant 40.3% Lebron James 35.4% Carmelo Anthony 34.1% Steph Curry is the only one who came close at 44.3%. Pella High grad Kyle Korver had the best 3pt% for the third time last year at 49.2% but that is extremely rare.
Only 17 players of any playing position made 45% of their 3 pt shots last year including one player who made 100% making 1 of 1, ha. Most of the higher percentage shooters each year are shooting guards and not point guards anyway.
Only six of those 17 players even played in half of the regular season games. They just got lucky in the few shots they took and are not considered in the race for the best 3pt shooter in the league for last year.
http://stats.nba.com/league/player/#!/?sort=FG3_PCT&dir=1
Fred had the best 3pt% in 2004-2005 at 48.28% and I think he was second the year before. The month before the season ended in 2005 Fred was ahead of Steve Kerr's all time 3pt shooting percentge but got an injury and finished below Steve's highest year. Kyle Korver broke Kerr's record in 2009-2010. You want to remember the year's record at the link below is just the best of the best not the normal 3pt%
https://en.wikipedia.org/wiki/List_of_NBA_season_leaders_in_three-point_field_goal_percentage