That's true, except don't forget two things. One, we are seeing White after two summer leagues and a full season in Austin. And two, White was 6ft coming out of high school. At that size, you have to develop not only a solid game against larger guards, but you have to work on court vision, etc. Basically, you have to accommodate for being a 6ft guard. Then, in college, he grew to 6'5. That's huge from a basketball perspective.
Lonnie strikes me as someone who has been athletically gifted and had the right size during every stage of his career. So he could rely on being more athletic and stronger than the other players his size. That gets negated to an extent in the NBA. But it means that he has to learn to adjust to a league where the average player is on par with you athletically or can compensate for it in a greater skill set. Anyone's guess as to whether he can make the adjustment to get consistent minutes in the NBA, but the Spurs do a great job of developing useful players with less raw athleticism and jump shooting ability. Lonnie has good jump shot mechanics that could help him translate into a good all around player.