In reality, the controversy that arises cannot change anything and those who are in authority and have full rights over this competition can regulate it.
Moreover, Flamengo is also not stable team, even though they have also been champions of the Brazilian Serie A several times in the 2019 and 2020 season, but in reality we see that on paper Palmeiras is the best.
All this time of instability is in the past, today are days of glory, always competing for titles, but without a doubt Palmeiras has done a little better, but it won't be forever (I hope so lol).
It very rare for team to really experience downturns and go bankrupt, but after several seasons they were able to recover with big changes and were even able to win the title, Flamengo showed how serious they were about achieving success.
They also experienced decline in performance after two seasons of being champions and this season Flamengo will still not be able to repeat the period of success in winning the title, maybe next season if they can fix some mistakes it could give Flamengo to the title again.
Honestly, now is not the right time to say that they have reached the glory days, and later when the competition starts we will be able to see whether Flamengo has really become success as you had hoped or not.
I would tend to make Palmeiras the favorite to defend the title this season.
All this professionalization that we see in Brazilian football began with the example of Flamengo's management, going back to the past in 2010-2011 Vanderlei Luxemburgo decided to take training to "Ninho do Urubu", a training center that would be a training place for young players from club, this place was practically just a piece of land, with precarious accommodation, which is how the idea of having a high-level training center began.
As Flamengo already owned the land, they only had to invest in infrastructure, this made a HUGE difference in attracting good players, as they would now have a European-class training center at their disposal. There where it all began, soon after Bandeira de Melo was elected president and the rest became history...
In short, it all starts from the inside out.