It's not uncommon for a player to choose more than one role in the ranked match search, and when the match is found...
Then start counting ban time without even knowing which function has been given to us... you lose a few seconds trying to find your role below your nick above...
Some role alert when the match is found, would be welcome...
You could even launch a screen to educate the role received, before the hero's choice ... and perhaps showing tips and a ranking of the most currently chosen heroes of the given role.