Chosen Solution
Per installment guide, looks like the adhesive gets destroyed during removal. I see there is a separate “iPhone 6s Lightning Connector Cable Adhesive” but it is out of stock. Would hope/expect the “iPhone 6s Lightning Connector and Headphone Jack” part would include the adhesive but don’t see it on the picture of the part and its not included in the fix kit.
Depending on where you order it from, it should come with adhesive reinstalled, at least that’s the case from the parts suppliers I use like Mobile Sentrix, Mobile Defenders, and Injured Gadgets.