Thank you all for your patience. I'm adding the following:
Mark Price. He is an ideal backup PG, offering elite 3-point shooting (40.2% 3P% on 3.4 3PA) which helps with my team’s spacing needs. He brings efficient scoring (15.2 PPG, 47.2% FG) and playmaking (6.7 APG). The dude is clutch, can be used in several different weays, and his off-ball shooting complements Erving and Robertson.
And my next pick is Glen Rice. He can back up either the SG/SF depending on what's needed. I need more outside shooting and he's a 40% career from the 3Pt line. Again, this gives more spacing. He also doesn't need the ball, which lets someone like Robertson or Dr. J get things going.