On Angel...
I never said that Angel wasn't synergistic or good - because it is (remember this deck came from an Angel Stax beginning). I said it was unecessary and I should have added 'at this point in development'. Skeggi is right, you can consider the Angel a lock piece in situations where you can negate your opponents attacks by gaining 4 life a turn. What I found, and it may differ from what you have seen, was that (1) most of the singleton creatures I was having a problem with in difficult-to-even match-ups were not affected enough by Angel if she made it into the mix (Tarmogoyf is typically a 5/6, Tombstalker is a 5/5, Dreadnought is a 12/12) without other support and (2) the match-ups/situations where Angel-lock was relevant were not significantly hurt without it, i.e. it was a tool which could be used to complete the job, but it wasn't necessarily the 'best tool for the job'. (Again, I'm not saying that you can't play Angel. I'm merely suggesting that those slots are not necessarily optimized.)

On Ajani...
I think Nihil said it better than I did, but to paraphrase - Ajani is clunky. If you need to use the second ability, Ajani won't last long anyways. If you don't need to use the second ability, Ajani probably isn't necessary. Your only hope of getting to the third ability is through the first ability and if Ajani is using the first ability, he's not using the second, so he's probably not necessary. Confusing, yes. Useful, maybe. I would again agree with Nihil that he is probably best served in a different (yet possibly similar) deck.

On Elspeth...
I'm not at all predicting Elspeth to be the piece that breaks Stax. I don't think you play Stax if you are looking for broken in Legacy. You play Stax because you like grinding out wins (or because you hate people in general ). I have 2-4 'non-optimum' slots in my list that I like to play around with and Elspeth has proven interesting. I have found a number of times when he's useful, but that's not to see there aren't still times when I don't wish he was Crucible #5 or #6.

-FB...