rippedtrojan , can wide grip exercises build a wide back- yes they can, but working ur midback harder like narrow grip pulldowns and close grip pullups, not all the way wide, will work better. why is that you ask? well its because of the range of motion, with a real widegrip pullup ur back is only going halfway, it is a very small range of motion as compared to a narrow grip pulldown where ur back goes thru the full range of motion.
both wide and narrow work on ur back, but if ur going for a wide latspread make the narrower exercises ur main focus and then use wide grip pulldowns and pullups to augment them, use them as an auxillary lift.