you cannot just put players together and make a super team. its about team synergy, how each of them adapt to each other, believe in each other, etc go into making a super team.
getting the best in each role doesnt mean super team, as sentinels was a normal team who put in the hours to be the best in their own role, nobody was the best when they started. exception of tenz pickup, rest all were picked and it was formed during beta. nobody knew they would be the best in their each role even though that was the goal.