Remember Jarno Trulli? He was in car number 7 in 2004 and Alonso was in car number 8. Trulli was fired. Skip to 2005, who is the new boy in the team? It is only natural that Fisi drives car number 6.Other damning evidence for you to pointlessly try and defend.
Alonso no. 5 aka number 1
Fisi no. 6 aka number 2
Say it, the R25 and the R26 were not competitive cars and Alonso won all those races just because he was number 1 at Renault and Briatore convinced every team to let Alonso win.