I think PSAL has a TON of good points here explaining JWill's game, and why his usage rate was what it was last season - I think I agree with all of them.
Acuff was a top scorer on VOLUME shooting last season. He is not going to get that type of volume at RU, barring massive injuries and disappointments from other players. And though he is a SCORER, he more a scorer than a shooter. His 3-point shooting is about 33%, which is only okay - though would have been 2nd best on RU's team last season to Fernandes. Last season, Fernandes was forced into a starting role, for which he was not suited (coming off a 17 ppg average for a better team in a better league - UMass in the A-10). Fernandes was athletic and quick, and if he had been 6'3" or taller would have been a real asset on defense - but at 5'11", though he did play very good on-ball defense, any opposing player 6'2" or 6'3" or taller simply shot right over him, and there was nothing Fernandes could do about it - and that was a real problem. Acuff's defense is not a known to me, but is rumored to NOT be his strength ... but he is 6'4", and in some ways while not being an asset on defense will not hurt as much as having a good but way too short defender on the floor like Fernandes - IMO.
IMO Acuff's best role is the role Hyatt SHOULD have had (and did have 2 years ago, sort of, until Mag's injury): A 6th man off the bench to provide offensive spark in the backcourt (vs Hyatt providing offensive spark in the frontcourt). Hyatt was a streaky shooter - when hot could fill it up, when cold needed to be benched, a good rebounder, an okay post defender for his size, incapable of defending on the perimeter, and below average in help defense. Hyatt just simply played too many minutes the last 2 seasons, a mark of the overall talent on the team more than his abilities. Acuff might average 15-20 minutes off the bench, subbing for either JWill or Harper - and at times for Bailey or Martini (pushing Bailey to the "4" slot).
Other critical role, but different from Acuff's role: Hayes as the designated 3-point shooter off the bench, to provide spacing, and punishment to opposing teams for help defense on Bailey, Harper and/or JWill. I expect Martini OR Hayes to be in the lineup for at least 30-35 minutes per game, to make sure there is always a potential 40% s3-point shooter on the court at almost all times ... Hayes limiting skill is the supposed lack of defense ... that could limit him to 8-12 mpg. If he had Derkack's athleticism and defensive instincts, he could challenge Acuff for minutes as the scoring offensive spark (though Hayes is really ONLY a spot-up shooter - 75%+ of his shots last season came from catch and shoot spot up 3's ... Acuff has a more multi-dimensional offensive game).
On Harper ... people are getting way too caught up in the debate on whether he is going to play or be a PG, or not. Think of Harper as a LEAD guard (like JWill is also a LEAD guard). J. Davis is a PG, not a lead guard. A lead guard can lead the offense, can trigger the offense, plays with the ball in his hands - but also has skills to play off the ball. Having multiple players who can BOTH play with the ball in their hands to create their own offense - and pass to open teammates to help them be better - but ALSO be dangerous offensively off the ball is a great advantage, and frankly more how the current game of hoops is played nowadays. RU has 3 such players now IMO: Bailey, Harper and JWill, with JWill having the least talent of those 3, but can still be effective in both roles.
People keep bringing up Illinois ... a PERFECT example of having LEAD guards, or equivalents. Illinois had multiple players who could create their own shots with the ball in their hands, command help defense, pass to teammates, but also play off the ball (Domask, Shannon and Hawkins). They also had multiple players who could hit the open 3 - including off the bench. RU finally has several of those types of players, even though they are young (Bailey and Harper, as comparable talents as Shannon and Hawkins - but less experienced).