Trials Of Osiris all about wining as a team. If you lose 3 times you get kicked out of trials and have to gain ticket there again. So if you join there with uncordinated group instead of organised clan you wont really have any change there. It does not matter how skilled you are personally if you aren't able to win as a team. I think that TOO is 3v3 mode so it will be much more important to be able play as a team.

You can join there as alone but if you want any change to gain anything ever you have to play there with your clan. Because best clans will keep wining there and stay in trials longer. There will come sense of rivalry. I know it is not same as private matches but i think it is much more interesting way to make competitive game. You play there to gain power and dominance over all other clans by negating any change to them gain win streak long enougth to gain best PVP loot in game. By Becoming stronger you make others weaker and i think this is really competitive Clan VS Clan play.