In that post there were so many unrelated or somewhat related but misleading things I dont even know where to start
First of all I suppose, where do you find, anywhere, that if you are missing a prereq the feat dissapears from your character sheet? then, where do you find rules that the same one 'comes back' from whatever place it disappeared to.
Also, the gp guideline is a completely seperate issue and is something that fluxuates. It is completely different than the situation here. Creatuers with X hd and class(es) Y(...) and race Z with templates of whatever have an exact number of feats. The money guidelines are just that, guidelines, and they fluctuate constantly. Feats do not. This is so unrelated I dont even know how to express it other than to just shake my head and walk away.
The ranger ability grants something that works like a feat, when you lose the benefits of the ability you lose the something that works like a feat.
when you lose prereqs for a feat you still have the feat, you just cant use it.
These arent 'semantic' issues, it is literally something being there or not. If I have a gun but no bullets I still have the gun, I just cant use it for much. If I have a gun and no bullets and someone takes the gun away from me then even if I get bullets later I cannot shoot them with a guy, I no longer have the gun.
There is a major difference between 'having' and 'not having' for the game.
If you can find a place in the rules that says feats you no longer qualify for, for some reason, dissapear from your character sheet and then magically reappear later feel free to post it.
Until then I am going to by what I posted earlier.
Cannot use and does not have are very different things.