All of this is pretty speculative right now because of COVID, player movement (including out of soccer) and club shakeups. Having said that, here are a few observations:
- This is only about boys soccer. It's pretty obvious, but you don't say that explicitly. For girls, ECNL would be at the top and the Girls Academy would be the only possible competitor, but it's brand new and hard to say how many of the former DA players it retained. DPL is the league below GA.
- For most clubs, ECRL is a LOT weaker in boys than the original poster seemed to suggest. That's because Boys ECNL wasn't necessarily strong in some of these clubs last year and their second teams could be Flight 2 or Silver-level teams in some clubs.
- on the other hand, Boys ECNL generally will have wide variation in quality this year if we have any games. That's because some of the Boys ECNL teams are former DA teams (although some will be losing players to MLS league teams), while returning Boys ECNL teams have a wide range of quality depending upon age group, with the worst teams pretty weak, relatively speaking. From top to bottom the gap could be large.
- The Elite Academy teams could also have a pretty wide degree of quality. The ones that are not associated with a club that has an existing MLS team may actually be better than the second teams of the MLS clubs. It will likely be a wider degree of quality in EA than in ECRL. The top EA teams could be competitive in ECNL, but just weren't granted access as a club, while the bottom could be lower-tier ECRL quality.
- The Premier, Discovery, and even Gold/Championship levels of CSL and SCDSL will likely have teams that could beat teams in any of these leagues. This is particularly true for Premier, since CSL has some smaller clubs in LA and Southeast LA where the boys are very strong. Some or most of those teams could be in CRL too. Some of these teams (e.g., Paramount. Kickers, Laguna etc) are just as likely to feed players to LAFC/Galaxy as they are to any of the teams in-between and they can re-load when they lose players because their coaches are dedicated recruiters and know their neighborhoods better than anyone. There are also strong teams popping up from these areas all the time that are strong, often with an affiliation to a larger brand like TFA.