Guerrero's problem is that he isn't a big enough name yet to draw the $$ needed to entice those names yet. No discredit to him for trying anyway, but if he is avoided by the bigger fighters, it's because of $$ not because of fear.
He doesn't care though because he was told "calling out other fighters means you get the fights and if they don't accept, it means they are scared of him".
Ortiz-Guererro would be a hot fight, really interesting one, I think I favour Guererro but could be dead wrong