The uncapped half-dozen are prop Kyle Sinckler, backrower Nathan Hughes, lock Charlie Ewels, wing Mike Haley, five-eighth Alex Lozowski and former Queensland State of Origin enforcer Te'o.
"History shows that when you're preparing for a World Cup you need depth down to four and five in all positions," Jones said.
"(New Zealand's) Stephen Donald was out whitebaiting and kicked the winning goal in a World Cup final wearing a jersey that was too small.
"That's the sort of depth you need. You never like to see players get injured but it presents opportunities for other guys to come forward."
Jones has been publicly critical of both Wood and Harrison but says he has been impressed by how they have responded.
Harrison may be drafted into the troublesome No 7 berth after impressing Jones in Northampton's heavy European Cup defeat by Castres.
"That was the best performance I've seen from a No 7 in a Premiership team," Jones said of a player who probably thought his two-match Test career was over after his June humiliation.
Jones said it remained an option to switch Robshaw back to his previous openside role despite him being a regular blindside since he took over, but added: "He's still our best six."