Here's an article I found about this.
Ultimate Rockets With Rockets young big men playing well, other young big men wait, watch
Kevin McHale quote: “They want to play more and I wish I could play them a little bit more, but I think our average (experience) for our team is under two years so everybody we play is young,” McHale said. “It’s not like all of a sudden we’re saying, “Gee, we’re not playing our young guys to play vets.’ We’re not playing our young guys to play other young guys. It’s just a matter of which young guy you want to play. But we have to try to work them into our rotation as we go.”