I don't like the idea of plugging Grant Hill at SG at all.
Why would Grant Hill have anymore difficulty guarding 2's than Reggie Miller would?
You're talking about taking a guy whose been a bonafide Small Forward (at 6'8") his whole career and plugging him in at a position he's not accustomed to and guarding the all-time best players at SG.
That's a big leap of faith and one I'm not buying at all.
What makes you think Grant Hill, out of position, can guard the top 10-15 shooting guards of all time?