According to Torvick, Watson is the 4th most valuable player (in conference play). However, this is more of an offensive metric than measuring impact on defense (Heise)

Stat explained here:
"basic idea is to estimate how many more points per game a player creates than a hypothetical "replacement player" would. The basic formula for PORPAG is:

Stat explained here:
"basic idea is to estimate how many more points per game a player creates than a hypothetical "replacement player" would. The basic formula for PORPAG is:
(OffRtg – 88) * %Poss * Min% *65