Lots of good questions.  My vote went to James largely because I saw what Armel was able to do a year ago in this offense and hope that James will be an even better version.  The ball should be in his hands a lot and JC and staff encourage point guards to score when they have the opportunity.  A few other thoughts:

JNJ is the most interesting storyline.  He can simply do things that most everyone else can not.  He is that athletic.  The question boils down to whether he can improve the things that he was not so reliable doing, such as taking care of the ball (which includes limiting his risky plays without stifling his creativity) as well as becoming a dependable outside shooter.

One of the more impressive things I can say about Jamison is the manner in which his game evolved last season.  He became an instant threat from deep but as the season wore on, defenses became intent on overextending their defense.  For a couple of games, Jamison looked flustered.  Then, he developed a sweet pump fake which brought his man into the air as he dribbled in for a higher percentage two point shot.  And from there, he developed a pump fake/step back move which enabled him to receive clean three point looks once again.  The sky is the limit as long as he continues to make concerted efforts at being one step ahead of the competition.  All-conference may be too lofty a goal but then again, who knows?

One thing the coaching staff loved about Sloan at Siena was how clutch a shooter he was during pressure situations.  I'd expect him to be a legitimate during the final 4 minutes of halves, particularly second halves where the outcome has yet to be decided.  Will be interesting to see whether the trio of Jack, Battle and Seymour will all see the court at the same time or whether we're more likely to see two at a time.  There will be some defensive shortcomings playing all three together so this will be entirely contingent upon the opponent and game situation.

Chase's competition for minutes really ought to come from Noel and Hunter (when available).  Matt is 6' 9" but his game is not ideally suited to play the 5.  Or, will JC opt to play a bigger backcourt with a smaller frontcourt at times?  A lineup consisting of Bishop or JNJ, Battle, Moyer, and a combination of Jack/Brelsford/Ball would fit this bill.   The freshmen are important here because Brelsford and Ball offer the size that JC would likely prefer when playing a smaller frontcourt.

The exciting thing about this team is that assuming most everyone pans out, there are a ton of interchangeable parts to work with.