"We've still got a long way to go, it's still definitely a work in progress," said Southby.
"We'll wait until we get through this series before we have a good hard look at [where we're at], the good thing we are getting some young players out there and exposed to what it is about. That was part of the plan for this part of the campaign.
"We know we haven't come up trumps against Australia and that is the biggest challenge for us."
The Silver Ferns will close out the Quad Series against South Africa in London on Monday, before taking on Wales in an historic two-test series. By the end of the tour Ferns' management should be armed with enough knowledge to begin developing clear plans of their starting seven and alternate lines.
For the likes of Sinclair and Jury, the remaining matches will provide them with an opportunity to put pressure on Purvis, Phoenix Karaka and Kayla Cullen, who were rested from the tour to give them a chance to recover from niggly injuries.
Jury said she plans to make the most of it.
The 1.92m defender said her eight minutes on court yesterday were "a bit of a blur", but she was pleased the Ferns continued to build on their lead after Jury took the court.
Despite marking a massive milestone today, Jury said the her biggest learnings have come off the court.
"It's definitely a new experience for me, I had never gone outside New Zealand and Australia before this [tour] so to get to be a part of this is amazing. There has been a lot of new information to take on board and I have had to adapt very quickly," she said.