There is room for me to slot back in, since I was eligible to play in the Premier League last season but had to withdraw. If someone from the top 10 places withdraws, I can slot in at no. 10, which is the worst possible performance for me had I played.
Madmarx doesn't play because it isn't anon. I have been strongly tempted to make games anon, but it would cause two major issues as I see it. Firstly, it would ruin the 'getting to know people' social aspect of the leagues; secondly, it would cause a forever of 'work out who is playing France' issues.
Top GR players do get an advantage, in that they can often be seeded into the C-level league from the first season, and failing that they are likely to be asked to fill in in the C-level at some point quite early in the season (V+ will play 4 games in C-level this season, in spite of the fact that he didn't quite make the cut, because of a no-show)
Allowing, say, 1 player direct entry into Premier League, A-level and 2 direct entry into B-level might be something worth looking at, though there is a concern that it would devalue the leagues, particularly if players fall below the point of their direct entry.