Serious question. We know that as of now Burks is very good at getting to the rim and scoring and quite bad at making a jump shot. Shooting guards in the NBA are usually the guys who can create their shot, score at the rim AND hit the jumper (most of them), or someone who can hit the open threes/ long twos and be a great defender (Bowen, Sefolosha). Burks in his first season made 29% of his jumpers. He did not much play this season, but so far there was nothing that indicated that his ability to make a jump shot improved (the current rate is 10%).
Out of the recent palyers drafted by the Jazz Ronnie Brewer had a similar profile - very good at scoring at the rim, with similarly bad stats on jumpers (28% during his rookie year) - but he really improved in his second year, to 39%. Brewer was also a way-above-the-average defender. Nevertheless, the Jazz traded him and now he is playing for a vet's minimum.
I know that many bigs come in the league raw and develop later, but I thought that it was different for guards. So, the question is, how often does it happen that SGs that come in the league with the ability to drive/cut to the rim, but without a jumper, develop the ability to be decent/good from the distance? How long does it usually take? Are there any good examples?