In fact the 2020 letter was signed by nine clubs (including Arsenal). The others were: Spurs, LFC, MUFC, Chelsea, Newcastle, Leicester, Wolves, and Burnley. It went direct to CAS in March 2020 before they had even started their main deliberations. According to the CAS documents the clubs "opposed any stay of execution" for City on the UEFA sanctions. So those clubs wanted us to be banned from europe and heavily fined even before the appeal had been heard. It is hard to imagine anything more unethical than a group of commercial rivals trying to intervene in a supposedly impartial legal process. I wonder if Richard Masters was copied in.