A) You want all your guards to be good shooters; PG's who aren't good shooters will have defenders lay off them a bit which can really limit their effectiveness. Bynes would be far more effective as a backup PG now if he could shoot.. Defenders back off him at times reducing his ability to drive and then watch him miss his shot.
B) By all accounts, GW is still recruiting one or more PG's. That should tell us that they aren't necessarily sold on Savage as the primary PG. If they were convinced, I don't think they'd be going after a guy like McDonald who is an obvious PG as opposed to Savage who is seen as a combo guard. Obviously a team needs multiple good ball handlers, but a team needs multiple good shooters, too.
C) To your point - We are a poor shooting team this year and we were bad last year too. The best shooter on the team this year - TT is graduating. Limited reports say that Paris is a very good shooter and that Garino is more of a scorer/playmaker than a pure shooter. Let's say we sign McDonald who is reported to be a pass first guard and no one else transfers out. Then this is our team
Seniors: Pellom, Bynes, Dwayne
Juniors: Mikic, Guest, Lasan (redshirt) Armwood (redshirt)
Sophmores: Kopriva, Davis
Freshmen: Paris, Garino, Savage, McDonald
Where are you going to get your shooting from on that roster?