As far as I know he said he'd like to play with Mark for Davis Cup, but he didnt mean anything else. Nico is a good player on this surface and Todd must think he has potential to be a good doubles partner.
In seeing recent matches (i.e. last few years), there is nothing too flashy about his play (it can get boring and "ugly," really) and there is nothing flashy about his on-court personality either. So why is he so popular? Are people living in memories of long hair and neon clothing??