Really? I can think of at least a few possible costs (or maybe, more correctly, value for playing Lauri). Whether these are actually at play, I don't know, but they all seem like possible things:
- Give Lauri more of a chance to practice his one-on-one skills and other "weaknesses" in a developmental season
- Give the youngsters a chance to play with real, quality NBA players (which may help hasten their development)
- Give Lauri a better chance to achieve individual goals (hard to do if they're not playing him)
- Maybe even part of the negotiation that convinced him to stay in Utah was that he wouldn't be completely shut down even if there was a season devoted to young player development. So, it's possible that they feel that they owe it to him
- Help make games more competitive, on the theory that young players develop faster when they aren't getting blown out most of the time