Sometimes I think about sending a trade offer during the season but the other guy does not have the version of the player I really want. When I calculate cap feasibility I do not have the money to make the trade and take the cap hit to swap the player out. So no offer sent.
Suppose though that in the offer I could specify which version of a player I want coming my way. For examply other guy has the 9 mil Brett. I send an offer but specify the expensive Brett be the one I get with no cap penalty since it is a trade.