Here's an example where there might be some ambiguity, taking Jorge De la Rosa as the example:
I did indeed "take the initiative" and saw that his 2008 stats show 28 G, and 23 GS. That leaves 5 games left over as a RP. So, here's the pitcher eligibility quote from Yahoo:
If a pitcher makes 3 starts he gains SP eligibility if a pitcher makes 5 relief appearances he gains RP eligibility...
Last year he was listed as SP/RP, but when I recently checked the Yahoo player pages, they now only list him as SP. So why did that change from the end of the '08 season to now if he pitched the required 5 games at RP to retain that eligibility? So much for initiative.
Based on the De la Rosa example, it looks like those eligibility requirements only apply to the season in progress, and don't necessarily carry over to the next season. So I'm back to wondering if the positions listed on the current Yahoo Player pages are reliable for keeper planning, and if not, is there a point where they will be?