As best I can tell, Danny Manning recruited one top-100 recruit to Kansas in his six years as an assistant there, and tagged along with Self on a couple of visits to Xavier Henry after he decommitted from Memphis.
Chris Mack has recruited better at Xavier, in terms of getting top-100 players, than either Sean Miller or Thad Matta. I'm not going to parse out who got whom at the very edges of tenures, but Matta coached there from 2002-2004. In the 2003-2005 classes, Xavier pulled 1 top-100 recruit, #56 Churchill Odia ('04). Miller was there from 2004-2009, and landed #100 Adrion Graves ('06), #48 Kenny Frease ('08), and (presumably) #87 Justin Martin ('10). Mack has been there since 2009, and landed #54 Dez Wells ('11), #49 Semaj Christan ('12), #98 Brandon Randolph ('13), #45 Trevon Bluiett ('14), and #78 Edmond Sumner ('14). (All rankings RSCI, except 2014, which is ESPN).
I fail to see the case for how Manning would be a better recruiter than Mack.