In my blueprint, which I'll post tomorrow, I'll go through the 40 man. We can take off the Free Agents, there are arbitration decisions, there will be DFAs, trades, etc.
I definitely encourage everyone to download to Offseason Handbook and to do their own blueprints.
I don't think "opening the season in the big leagues" has anything to do with 40-man roster adds. It probably is down the list of decisions on current 40-man roster guys and whether they stay on it too.
Yet you can't have too many guys on the 40-man who aren't major league ready. That's my point. Unless you are a total rebuilding team and will allow guys to play in the majors when they aren't quite ready. Plus, you need the flexibility to add those "minor league free agents" for a moment or two. Once you do put a player on the 40-man roster, it is easier to claim them if they are removed and keep them in the claiming organization, unlike the Rule 5 where you have to keep them in the majors ALL year or return them to the original team.
You can't have 12 or 15 guys who aren't major league ready taking up roster space.
Or can you?