Yes, in the previous threads from 2020-2017, it appears to be the case that acceptances are mostly sent out in February. If you go read those threads, you'll see a ton of people saying they received an acceptance in February. There are a couple of acceptances that come in early March, but they are very infrequent. This leads me to believe those come from February people declining their acceptance. Then there's sometimes a waitlist that comes for just a couple of people right after everyone else is rejected in mid-March that appears to have spots left from anyone else that declines that can go up until April, probably coming from people that were offered an acceptance in March that then declined or anyone from February changing their mind last minute.