While I have very much enjoyed writing for this thread, the experience has also made me appreciate the amount of work that goes into generating new content on a day-to-day basis. So, in all sincerity, hats off to Grey for keeping this site going. I have seen enough fantasy sites languish to know that Razzball is an exception (and a quality one too).
As for the categories, I agree with what you think you have sown up and what is still up for grabs.
1. Percival's performance since his return from DL has been extremely disappointing. Right now, I am considering dropping Casilla to pick up Wheeler. Dropping Casilla would mean that I go without anyone at MI, but if I am going to win the current matchup anyway, that would not matter. The question, of course, is whether I feel confident about winning the current matchup. It would be the height of foolishness to preserve an advantage in saves at the cost of my playoff chances! Note that I would not be so nervous if my other closers were more secure. With Wagner and Saito pitching again and soon to return, I am faced with possibly losing the closing services of both Ayala and Broxton by the middle of next week. If Percival loses his gig due to injury or ineffectiveness and I do not manage to grab Wheeler in time, I could be in real jeopardy.
I'd grab Wheeler. I do think Ayala's run as closer could come to an end soon. re: Saito -- I wouldn't be surprised if him and Broxton share duties.
2. Longoria has been activated, but I am keeping him stashed in my DL spot for the foreseeable future. Longoria technically had an arm injury, and not a wrist injury, but I have zero faith that we will see much power from him for the remainder of the year.
3. Cameron is out with a sore left knee tonight. And he has not performed all that well during this week - he has gone 2 for 16 with 2 runs and nothing else for me. If Dickerson were available, I might have already made a switch. Right now, my likely options are Milledge, Butler or Choo. I am staying put because I can afford to at the moment, and I believe that Cameron has the highest upside of this bunch. If he is hot anytime after next week, I could end up being very thankful.
I wouldn't be too patient and would consider making a move. Cruz has the most upside, Butler's can stay hot for a few weeks and Dukes and Milledge are pretty similar.
4. I am not sure why Lilly is 99.2% owned in ESPN, while W. Rodriguez is 22.7% owned and Wolf is 20.4% owned. Those pitchers are not that different, in my mind. J. Johnson is 45.5% owned and Arroyo is 41% owned. Lilly gets St. Louis next and, I think, J. Johnson is due for Washington. I have to think more on this, but I might be holding onto the wrong pitcher.
I don't think anyone can get their heads wrapped ownership in ESPN leagues and I think it's more because of the lack of active owners than anything. I'd move to Johnson.