Olynyk will need to earn his time back. Hump, Bass, Fav and Sully have been playing well collectively and individually which has led to team success.
You don't hand back playing time to a rookie that was playing in an underwhelming manner before he got hurt simply because he is returning. Long term, its probably in Olynyk's best interest to have to compete and beat out someone else for the playing time than to just be given that playing time.
If he's as good as some of KO's fans think he is, this can only be a good thing and will make him better overall. Let's not hurt his long term development simply because some fan boys think he should be getting the time right away, without earning it. Make him earn it, it will toughen him up and set the right overall tone in the locker room.