brackets

I have a kitchen island that is made out of old pine with a granite countertop.  At the time it was installed, the brackets were not yet ready.  They too are pine and were being custom made.  We are now ready to attach them and my trim carpenter and contractor are arguing about what would be sufficient.  The "natural stone people" have told the contractor that these wood brackets could be "siliconed" to the granite and affixed with hardware to the pine island.  My trim person says that silicone will not bond properly to the wood and that these wood brackets must be affixed to the granite by boring holes into the underside of the granite.  One is obviously easier to do than the other.  Is the former going to work?        ABR, Jackson, MS