Sry if it wasn't clear!
What i meant was: with some bosses, there's a strategy (a specific movement & attack pattern) that works well if there's mutual understanding with the other players in-game. But when there's a lack of understanding (poor coordination) from the other players, this can lead to a slip-up (death). When i boss alone though, everything's under my control.
But here's the thing: I can't choose whether i want to boss alone or with others, cus anyone can freely enter the portals since it's an online game.
Hope i didnt make it more confusing lol!