'Matt' commented that since Patterson usually gets injured anyway, if he's going to draft someone for half a season, he'd rather get Clemens. On the surface, this makes sense, but there's a problem with thinking this way. Let's make some assumptions (some of which may not be true):
1. Patterson will get injured half way through the season and be out for the year.
2. Clemens will come back halfway through the season and be healthy.
3. They will go for equal prices on draft day.
4. Clemens is better than Patterson.
So we should obviously pick Clemens, right?
Not necessarily. At least in leagues with relatively shallow benches. Clemens is going to take up a roster spot for the first half of the season while he sits on the bench. Patterson can be dropped as soon as he blows out his arm halfway through the season. This will allow us to pick up a replacement. In a league with shallow benches, for example Sportsline Public leagues with a two man bench and no DL, this is a big deal. It means that our choice is really between a half season of Clemens or a half season of Patterson + a half season of some replacement level pitcher.