Zito as has already been mentioned is a victim of overuse. Unless he hits the DL, It wont hold him back too bad though. Top 15 SP 2nd half numbers is unlikey, but he should be able to put together above average top 30 SP numbers from here on out.
Dont forget how the A's entire teams seems to somehow come to life during the 2nd half the last several years. Its not as table top explainable as chemistry, its electricity, it just happens leaving everyone slightly confused as to how.
What is the worst that happens if you buy low on him now? You end up not paying very much for dissapointing expectations.
I dont know how Finley was dropped in any league after hitting over .333 in June. Finley is solid, but that is a great and classic sell high / buy low trade.
"Son we would like to keep you around here but were trying to win a pennant this year."