I acknowledge that Vonleh is young, and shows physical gifts that indicate he should be a power forward that makes it in this league. But to make it, he has to show progress. Here's his numbers for his two years in the league:
Noah Vonleh:
2015 - PER: 13.2, MP: 10.4, Pt/36: 11.5, Rb/36: 12.0, Bl/36: 1.3, PF/36: 2.8, TS%: 47.5%
2016 - PER: 8.3, MP: 15.9, Pt/36: 8.4, Rb/36: 9.3, Bl/36: 0.6, PF/36: 4.7, TS%: 45.5%
I think the Blazers have given him ample time to progress. His numbers don't look anything like progress. I'd call that regression.
Compared to Leonard's last two years -
Meyers Leonard:
2015 - PER: 14.8, MP: 15.4, Pt/36: 13.9, Rb/36: 10.6, Bl/36: 0.6, PF/36: 4.8, TS%: 63.1%
2016 - PER: 11.4, MP: 21.9, Pt/36: 13.8, Rb/36: 8.4, Bl/36: 0.4, PF/36: 4.9, TS%: 56.3%
It looks to me like Meyers Leonard has plateaued. He is what he is. A solid rotational player that has good usage in certain types of match ups.
I think Leonard has earned the opportunity to get more minutes. Vonleh has not demonstrated to me that he is making enough progress to warrant starting, let alone taking up minutes of a player that is performing at a higher level than he is (Leonard).
If this was a throw away year, maybe I could see continuing to start Vonleh. But since the Blazers are in the thick of the playoff race, I think we need to start and play our best players. In my opinion, Leonard is our best option at PF/C to complement the skills of our other starting big, Plumlee.