Yes but NBA 2k only has 12 players per team. Football has 53 plus practice squad and a ton of free agents to create. That there is a lot of data.
I've never played an NBA game because I'm not much of a Basketball fan so is there also MUT mode and practice mode and everything else that is in Madden?
Also the playbooks, etc. I just think there has to be a lot more to code for Madden than the NBA game but not sure.
We have no idea really how much space is left on the disc when it is done but why would they take some things off to add something else if there was plenty of room?
For the best experience I'd think using two discs loaded with everything we have asked for would do it.