If you’re truly an excellent product manager, then you know better than the stakeholders and do not need to collaborate with them. Just do what you want and prove your awesomeness. It’ll be fine.
#NotMyAgile
I see that you are using tasks as part of your stories in the agile tracking system. I understand you also think you're doing kanban. But kanban doesn't have tasks. So you're not doing Kanban.
#NotMyAgile
Last few iterations you worked together and completed your iteration goals. Now we’re gonna really rock this. Starting this iteration, each of you will have your own goal.
#NotMyAgile