Tiebreak rules for Team Battles

According to some investigations the tiebreak rule for teams that have the same score is the average performance of the team leaders. Unfortunately, if you click on the team there is only shown the average performance of the whole team (including the leaders and all other participants). It would be nice to this tiebreaker score visible as well.

Pushing that thread @thibault - waiting for an official responce.
Thanks in advance for all the work you do!!!
( Yesterday; in the 1. Bundesliga, my team managed the save with the score 318 and made 7th rank, while another team, with even score of 318 got on 8th rank and has to leave the league... We been wondering why that - what is the tiebreaker - and noone in chat gave us the clear responce - lichess.org/tournament/nQ5KbYA5 )
The sun is shining in Wattenscheid :) - Regards, Funkmaus.