I think the only three players on the Raptors with guaranteed spots in both the starting lineup and/or closing lineup are Kawhi, Lowry, and Anunoby. The other two spots will be matchup based.
The one player I think people are seriously overlooking in all of this, is Jonas Valanciunas. Nurse is a big fan of his, and has worked with JV individually over the last few seasons on a lot of aspects of his game, helping him to become more of a 'modern' big man. If there was one player who I think might be the odd man out, it's Ibaka. He seems to be getting worse each year, and I wouldn't be at all surprised if he ends up being a 15-20 minute per game sub this season.