We dont need to replace the dross, the squad was too big. All of the new guys you mentioned are better than the ones that left, IMO.
We do still need 2 or 3 quality signings, a LB in particular for competition, but I'm liking the look of the team thus far, albeit with some rigerous defensive training drills.
I think that stand out player you desire will be Ngwatala and the boy on trial, Nabli certainly has a bag of tricks