I think this will only favour geng they are already heated up whereas sen had a cooloff period. Also Geng are going into the series with a winning momentum whereas Sen is coming from a historical throw
Just didn't want to pay for another day at the venue ig. Other option was to do all opening matches one day, all UB/elim matches next day, and then the 2 decider matches on the last day. But then you'd have to do 4 matches a day for 2 days.