I just explained how. It's common sense.
Again, I explained why I said that. That he's the fourth big the majority of the time is irrelevant. Almost every fourth big the league is clearly better than him.

It's Australia and they were missing Bogut. They're not terrible, but suffice it to say, they don't have the embarrassment of riches that the U.S. has.
Ayres had solid numbers two seasons ago and as such, there was reason to think he was on the verge of establishing himself as a fourth big. People keep pointing to two brief, respectable appearances by Baynes, as if they supersede the rest of his play.
Most Spurs fans, like every fan base, have little to no clue what they're talking about. The fact that Baynes is bizarrely beloved and Ayres is despised (despite the fact that there's little, if any, separating them) proves that.