D Docket 02/06/2015 Page 18 of 20 same set of facts. This reality should be the decisive factor in favor of allowing joinder here. See Hawkins I Fulton Cnty., 95 F.R.D. 88, 91 (N.D. Ga. 1982) (allowing new parties to be added under Rule 21 because denying motion "would only result in the filing of a seco