I’ve compiled the RPRs back to Jodami. Three columns: 1) Best RPR 2) Gold Cup winning RPRs and 3) Best OR. For the purposes of general comparison a list of Timeform top-rated steeplechasers since 1975/76 follow that together with an indication of overall performance for groups of Gold Cup winners before that.
Best RPR, Gold Cup winning RPRs, Best OR
2012 Synchronised 175 175 167
2011 Long Run 181 181 182
2010 Imperial Commander 182 182 185
2009 Kauto Star 191 (175, 185) 193
2008 Denman 184 184 182
2006 War Of Attrition 173 173 174
2005 Kicking King 177 177 175
2004 Best Mate 178 (176, 178, 172) 175
2000 Looks Like Trouble 173 173 170
1999 See More Business 176 172 177
1998 Cool Dawn 172 172 175
1997 Mr Mulligan 174 174 178
1996 Imperial Call 174 174 168
1995 Master Oats 176 176 181
1994 The Fellow 174 170 176
1993 Jodami 172 172 178
In addition the following is a list of Timeform’s highest-rated steeplechasers since Chasers & Hurdlers began in 1975/6 (excluding Sprinter Sacre):
191 Kauto Star
187 Desert Orchid
184+ Moscow Flyer
184 Burrough Hill Lad
184 Long Run
(Selected others: Best Mate 182, Captain Christy 182, Denman 181, Master Minded 179, One Man 179).
There is a list of others going back several decades rated on rough equivalents: 169-174 (designated Average) 175-179 (Superior), 180-190 (Great) and 212 (Greatest) i.e. Arkle. Those 168 and below fall into the Inferior or Poor categories (...as Gold Cup winners that is).