I've remained silent on this issue until now, mostly because I didn't think it was my place to comment on it - and I'm not exactly the world's greatest or most respected mapper, so I also don't feel qualified to judge someone else's maps. Ultimately, I think the idea of @Frost-Core being owed map slots because they started the project is admirable, but probably not necessary. Let's be real here - it doesn't take that much effort to just come up with an idea for a community project, especially one that's just a slight modification of project parameters that have been used countless times before. I'm very grateful to Frost-Core for being willing to put a thread out there and inspire lots of people to create cool maps - but the level of absenteeism exhibited by F-C in the thread makes it very apparent that they did not understand (or care to learn) the role that a project leader is expected to accept. I won't ascribe any sinister motives to Frost-Core in this whole ordeal; I merely think they were an excited new member whose mind was overflowing with possible Doom ideas after finding a community of like-minded individuals - we've all been there at some point!
However, I think the complete lack of contact with Frost-Core over the past 2 weeks, especially considering the original project deadline came and went during this AWOL period, means that F-C has effectively abandoned the project. Additionally, I think that almost everyone who submitted a map to this project, regardless of quality, at least responded to feedback and posted further revisions of their maps... as far as I can tell, F-C basically just wanted to consider the maps done after first posting. I'm not going to outright say "these maps aren't good enough to be a part of this project," because that opens a can of worms by which we could start arbitrarily determining what "deserves" to be in this project - not exactly a standard we want to set, as everyone has their own subjective idea of what constitutes an acceptable Doom map. Especially considering the highly restrictive line limits on this project, I'm fine with people producing maps that are a bit outside the realm of traditional "quality". I think the key difference is the complete lack of effort to improve or revise the maps, even after seeing countless constructive posts on how to tweak or improve the map. Every map making exercise should be considered an opportunity to improve your craft and learn something new. I think Frost-Core probably hit a wall after realizing the amount of effort that might be required to reach the "standards" of the rest of the maps that started to be contributed, and gave up - which is not a failure on their part, that was basically me for the first 15 years I was on this forum!
Over the course of the thread, I think we've all inspired and pushed each other to make better maps, discussed the key design ideas of low-line-count mapping, pointed out places for improvement... this is the sense of collaboration that a community project is supposed to bring to its participants. Beyond offering some basic contributions and making the bare minimum effort to be considered the "leader," I don't think Frost-Core really had a full investment in the project as a living document and a collaborative effort meant to be greater than the sum of its parts. Additionally, @Arsinikk has picked up the slack to a degree that goes above and beyond what anyone could have reasonably expected... which by itself shows to me that they care more about this project than Frost-Core ever did, and I've considered them the leader for a while now, anyway!
So, at the end of the day, what do we owe Frost-Core's "legacy" in this project? I don't know - something more than nothing (just out of a general sense of respect), but considering the abundance of creativity, enthusiasm, and productivity many participants have shown over the course of this project's lifespan, I think it's more than acceptable to replace their maps with two new contributions, and I don't think it would be that hard or take that long to find willing participants to offer up some replacements. After all, a real leader would want the project to be the best possible product it could be, even if that meant taking a back seat in some respects.