http://www.nba.com/advancedstats/player-vs-player.html#Marcin-Gortat-vs-Steve-Nash|101162,959;year=201112;season=r
Gortat is assisted on 80% of all his baskets, I believe tops in the league pretty much, fact
Gortat's FG% goes from 57% with Nash on the floor to 47% without Nash on the floor, fact.
52% of Gortat's shot attemps when Nash is on the floor came from under the rim, fact. (42% with Nash on the bench)
63.4% of Gortats made baskets came from under the rim when Nash was on the floor, fact. (55% when Nash was on the bench)
4.6 FTA per 36 with Nash, 2.6FTA per 36 without Nash.
11.5 rebounds per 36 with Nash, 9.8 per 36 without Nash.
Gortat is probably more dependant on another player than anyone else in the NBA.
I don't have access to synergy stats but midseason he was much less effective in post-up situations than even Markieff Morris.