Player B looks OK. I'd train his OD. At 6-3 he has decent enough skills to play as a guard. He's a project though. It will take 3 seasons before he's a decent starter.
I would add a couple trainees to train with him this season in the PG position Pressure.
After the season you can decide what to do with him. I would base it on what other draftees you get next season.