Guzman's obp this year is .314 :puke so I would say no he can't leadoff. I'm not really sure who else is out there to be a leadoff and that also has a good glove, guzman fits the good glove but not the leadoff man type. Like I said if Contreras fixes his flaw then keep the rotation as is and that rotation is going to be more then solid, somehow find the shortstop we're all looking for, a cheap catcher, fill in the pen and the team should be good to go.