With deep stacks, I always fold top pair!

[A_PLUS]

My problem with your line (and I don't think you are necessarily wrong), is that it really comes down to a preflop read.

Lets say, for arguements sake that the guy in the middle decided to call a raise with a decent hand, say A9s. At what point in this hand, do you think that his line doesn't fit this hand?

I don't know, I dont think weaker aces are as rare as you are assuming. Regardless, this would be a borderline call, but a call I would probably make.