Read the first post about how he is ranking things. It's not based on how easy it is to solo. It's based on the group content in GK and WT. Most combos can solo to 80. I did it the first time with Unarmed and Psychology, not a really high damage skill set and by far one of the least powerful I've ever used. His power rankings are based on some assumptions, and soloing isn't really part of it.

Spider/Warden is a decent combo. Warden pairs well with any animal skillset, it's extremely good. I've run it with Fox, Unarmed, Mentalism, Psychology, Druid, and Deer. Works well with all of them. I like it best with Fox and Ment. Privacy Field over 2k makes soloing very easy.