Tsonga and Berdych have a slam final and a M1000. Ferrer doesn't have a Slam final and could finally won a M1000 when everybody else tanked and faced LLODRA in the SF and JANOWICZ in the final. Berdych and Tsonga are actually a threat to the top guys. Tsonga beat every top 4 at the slams. Both beat Federer at Wimbledon. And when they are facing them in at the later stages of a tournament you know they won't be demolished like Ferrer did against Nole at the AO, or against Nadal in RG. Ferrer is a great and consistent player, but he doesn't have a chance when he faces them. And he doesn't have any great highlight in his career to be placed above them. Davydenko never reached a final at a GS, but he had some close matches with Federer at the SF and won 3 M1000 and a WTF. So you could make a case for him being better than Berdych or Tsonga (it would still be close).