I dont want to say hes afraid of Jones... but its kind of sad that hes singling out GSP, especially because of his smaller frame.
Jones is clearly the better challenge for him, and I think the majority of fans have switched from waiting a GSP/Silva superfight to a Silva/Jones superfight.
GSP has plenty of fights left at WW. The only top 5 he has faced already is Fitch. Silva and Jones have cleaned out their divisions, GSP has not.