Orlando lost other players to injuries besides Nelson - Pietrus being the most notable case. In our 1st win over them this season they were without most of their backcourt players. Other teams like the Spurs or the Jazz have been more severely hit by injuries than the C's. Or non-playoff teams, like the Bucks, the Clippers, the Wolves or the Warriors. Teams like the Lakers or the Cavs also lost starters and crucial rotation players for extended periods of time, although Boston has arguably been more unlucky.
SVG surely has a point.