Irys covers are probably her audition material with MVS attached. That's why she casually drops them with no premiere or promotion past the original announcement. When she actually premieres and promotes a song the other ENs will shill it for her and it will fly past a million quickly.
This idea that any Holo with the EN tag could ever need saving is borderline cringe. All they have to do is breath and not offend anyone and will succeed.