At least one guy — Scott Ostler of the San Francisco Chronicle — thinks so. He talks about improvements made by Angel Pagan and Brandon Crawford, each of whom worked closely with Bonds in Arizona, and thinks they are in no small part attributable to his instruction. Pagan is particularly effusive of Bonds’ advice.
I’m skeptical that an entire season’s worth of hitting instruction can make huge, consistent differences, so I’m not about to say that Bonds’ presence is the reason for the Giants early offensive success. But I do think it’s interesting as a data point in the “rehabilitating Barry Bonds and letting him back in the mainstream of baseball” campaign.