Jazz are still "baking the cake" to an extent. We want to get to the playoffs on the backs of our main core, not a guy like Ryan Anderson. He is probably better than Lyles at the moment, but Lyles could be better than him by the end of the year (will almost certainly be healthier). So if we got him, that would get Lyles less growth and hurt the future of our team.
Lyles can not get the attempts up enough to become a threat. His shot too slow.