Yabusele (not Yasubule, LOL) is hurt, as it's been said. Besides, maybe Zizic is playing with his national team and doesn't go to summer league either.
I can settle for watching them at full speed since the beginning of training camp. For SL, we'll have Jackson, Nader, Jaylen, our picks this year (1, 37 and a couple of 50s) and maybe some undrafted FAs or guys who have played for Maine this year. I don't know if third year players (thinking about Mickey) will play. They usually don't but in cases such as James Young with few NBA minutes it helped, so there is a possibility Mickey plays to keep his place in the league.