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:) I just read over your message. I see where you could have some concerns, and as mack said you will pass along PR and thats the fun of ranking. But I'd also like to bring to your attention that many sites people saw dropped ranking all together to a notch lower because of algarythm changes within google. I myself saw many of my pages PR drop a notch, I even have more links but it still dropped and I blame it on how google changed their rythm. So it could be possible that your site was also seen to have dropped PR with my sites :P
PR5 and over a low PR site dropped link may not show, you would remain PR5 but a lesser PR5, maybe PR5.3500, rather than PR5.4500
To lose PR5 would take a more dramitic loss than a PR4, all things being equal.
As I know to my cost