And if you're gonna deal why wait? An injury or disappointing start to the season and you could miss out on the prized prospect that you might want most.
They also have to factor in that these teams are wanting to set their rotations for opening day, not sometime in June. If you don't deal there's a good chance that some suitors move on to plan B or C or D.
I would agree that sellers have the most leverage, but there is a downside for being too cute for your own good too.