This could be a solution to the problems with Franchise Freezing with the new rosters.
I was working on my rosters and advanced all the players using Finn's Editor. When I did a search for rookies, there were a number of 'nameless' players listed but I could not edit..I figure these are placeholders for the franchise mode.
Here someting else...
There are a number of players without teams...(like Steve-O which you can unlock) and if you create a team you players will be listed without a Team in Finn's editor.
If Finn can find a way to access these 'Rookie slots' and find the unlocking mechanism to move teamless players to F/A I think that would easily take care of the 42 New Player issue and possibly freezes in Franchise.