Yes, every team hypes their prospects.
But the Tribune - the Cubs' "house organ" and corporate partner until very recently (and old habits die hard) - has proliferated pro-Cubs prospect propaganda to its readers for years. And the lazy lemminglike sports media aggregates, echoes and amplifies what's already out there.
Consequently, Cubs prospects get more hype than almost all other teams' prospects.
The universe is the practical joke of the General at the expense of the Particular, quoth Frater Perdurabo, and laughed. The disciples nearest him wept, seeing the Universal Sorrow. Others laughed, seeing the Universal Joke. Others wept. Others laughed. Others wept because they couldn't see the Joke, and others laughed lest they should be thought not to see the Joke. But though FRATER laughed openly, he wept secretly; and really he neither laughed nor wept. Nor did he mean what he said.