Control start button in combined view

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I am starting the move away from legacy manage and into the combined view but have come up against a hurdle that I need some help with and wondered if anyone has the same issue.

 

I have a user that manages a team and so uses the ‘manage’ view to see what activity these users are doing and wants to look at details etc. He also does his own activities sometimes and so has access to ‘My Route’ to allow him to do this. The challenge I am getting is that when he goes into activity details he sees and can use the start activity / end activity buttons for all activities regardless of if they are assigned to him or one of his team. I think this is because they use the same screen