I think the roles and minutes of the supporting cast around Harper and Bailey have yet to be determined - and in fact may vary depending on the match-ups game to game, within games, foul trouble, etc.
Pikiell has repeatedly emphasized how flexible the roster is, specifically how so many of the players can play multiple positions.
I'll give you a specific for instance: J. Williams. People sometimes forget that he was actually a STARTING POINT GUARD for Temple for TWO seasons, as a freshman AND a sophomore. As a freshman and sophomore, Williams started 37 of the 38 games he was available to play, as Temple's PG, averaging essentially the same each season: 9.3 or 9.5 ppg, 4.1 or 4.3 ass/g, 3.6 and 3.5 reb/g, 1.2 and 1.4 stl/g. For the 12 games he was available for RU he scored more (12 ppg) with better overall FG (44% FG) shooting than he 2 seasons at Temple, even while having a lower 3-point FG% (21%, vs 32% or 23% respectively his 1st 2 years).
Now, what that means for Williams expected performance this coming season, I do not know. But he was a solid performer as both a freshman and sophomore at PG at mid-level team in a higher level mid-major conference, and was RU's best player in the 12 games he played last season. I have to figure Williams will be a solid complementary performer to Harper and Bailey.