answer-chaining-tagged questions should be sorted newest to oldest by default. It is disorienting to see them out of order because they are sorted highest to lowest votes. Agreed?
This is not possible I'm afraid, unless SE decides to add that feature network-wide. PPCG is a small community compared to SO, SU and the like, so I think we'll have a hard time convincing the developers (and everyone else) that this is something they should spend their time on.
The only foolproof way to sort a answer-chaining challenge is by Oldest, and scroll to the bottom of the last page. It's not that much work.
Please do not sort by "Activity", that might result in you missing the latest post, creating a lot of work for you and potentially others that base their work on your answer.