Grand Arena matching

The number of GL's or GP size is not really a good metric, I only have 6 GL's in K2 and I only had 2/3 when I entered kyber 3 for the first time and was battling accounts with all GL's. To progress you need to build your roster to compete with these larger rosters over time as every win will move you up to compete with this size of roster permanently. It is easier in Bronzium as you field and require fewer squads. So, these battles are perfect to practice off meta counters and optimise your squads and strategy to outperform larger rosters than your own. After every loss I reflect on what could be better in my roster, if its my opponent is extremely out of my league and I stood no chance, I still try to focus on what worked and did not. They may have better modding which can indicate where you will need to improve yours before Aurodium.

These players have every right to play as much or as little as they like, this is their current performance level, if you want to progress through them into Aurodium which is full of even more of these type of rosters, you need to learn to out maneuver them and grow your roster with what is missing (it will not just be GL's). 

If you can not deal with this type of roster in Bronzium then be grateful they prevent you from winning more often and entering Aurodium by giving you a quick loss every now and then. Otherwise you would be thrashed every round before being returned to Bronzium. I have been there when first progressing from Aurodium into Kyber and it was frustrating for a long time and the slight daily increase in crystals did not cover the long losing streaks denting my crystal income.