It's a stupid idea, regardless. I couldn't tell whether it was employees of the club or actual STHs who were asked to hold the flags but either way, flags belong in the hands of the supporters, not temporary flag-bearers. I have a feeling MLSE are so desperate to create a vibe in the stadium that they are looking at footage from around the world and trying to implement anything that they can get away with. Flares/smoke bombs are prohibited in MLS so MLSE decided to try out artificial ones. When that failed, they decided to use the pre-game flags, possibly after looking at footage of Chelsea games or some other European club(s). It seems like they are trying hard to duplicate other leagues but the answer doesn't lie in artificial flares or temp flag-bearers, it lies in the form of an improved stadium. Enclosed roof and/or second tier over the south stand is a start. Unfortunately, without a winning team on the pitch and increasingly more empty seats, stadium upgrades aren't likely to happen anytime soon.