This I don't understand. Toro Rosso is meant to be the Red Bull junior team, but Renault is their only team in F1 and while Nelsinho haven't racked up the podiums and points, he's been better than Bourdais and Grosjean haven't been stellar after his crash in Monaco.Reportedly Renault is changing too, replacing Piquet with Romain Grosjean, who has been driving GP2 this season
Also, Nelsinho haven't really been able to challenge Alonso like Hamilton did, but Hamilton is exceptional, and Alonso can't be the easiest challenge to take on.