Not sure how Lowry does not fit. Late pick that was developed. It doesn't matter what team developed him.
Who developed him? He bounced around quite a bit before he finally settled in with the Raptors. He was a starter every where he was though and for the last 2 years with Houston though where he averaged 13.8 ppg and 6.6 assists. His first year in Toronto he averaged 11.6 ppg and 6.4 apg. He blew up in his 2nd season there, averaging 17.9 ppg and 7.4 apg. So who developed him? He spent a few years in a few places but didn't come into his own until his 2nd his second year in Toronto. That could have been him getting in shape like Ouchie mentioned or it might have been something else. That's quite different than guys like Dinwiddie, VanVleet, or Tony Parker who stayed with 1 team and finally managed to take advantage of the opportunities presented. He didn't have a lack of opportunities and played for a good while as a start but at a less efficient level.