There is a myth that Karl doesn't play rookies. In fact, because Karl's teams are almost always in the playoffs - in 19 of his last twenty year's he made the playofss while the one year he missed, Milwaukee finished 41-41 - his team's rarely have a highly touted rookie. In fact, the majority of the rookies on his teams in the last twenty years are almost never better the bit rotation player or boderline starter.
I went through the team year-by-year starting with his first full season in Seattle:
92-93 Sonics - No Rookies
93-94 Sonics - Ervin Johnson, Chris King
94-95 Sonics - Dontonio Wingfield
95-96 Sonics - Eric Snow, Sherrill Ford
96-97 Soncis - No Rookies
97-98 Sonics - James Cotton
98-99 Bucks - Robert Traylor, Paul Grant
99-00 Bucks - Rafer Alston, Mirsad Turkan
00-01 Bucks - Jason Hart, Joel Pryzbilla (18 years old), Michael Redd (2rd round draft pick)
01-02 Bucks - No Rookies
05-06 Nugs - Julius Hodges
06-07 Nugs - Yakhouba Diawara (averaged 20MPG)
07-08 Nugs - Turean Green
08-09 Nugs - Sonny Weems
09-10 Nugs - Ty Lawson
10-11 Nugs - Gary Forbes, Mozgov
11-12 Nugs - Stone, Hamilton, and Faried
12-13 Nugs - Q Miller, Evan Fours
Only three top line, boderline All-stars on the list - Michel Redd, Faried, and Lawson. Lawson played 20mpg backing up Billups. Seems reasonable. Faried played 22mpgs backing up NEne in first half of the season - in a season with almost no camp and no practice time. Redd was a second round pick who was a long shot to even make the roster.
Plus since his teams are often 50 win plus, it pretty hard to argue that many of those rookies were better than the guys playing in front of them.
In you look at the results objectively, Karl has notthing against rookies, as long as they help his team win more than the guys in front of them. But, he has never been lucky (until recently) of having any good rookies on his team.