1. A sorcerer is Not a fighter/wizard.. s/he is just an alternative wizard.
I have a hard time picturing Sorcerer as "just a different kind of wizard" because of its spontaneous casting. There is something else about spontaneous casting that influences the role of a class beyond the list of spells which the class uses. It's important enough that spontaneous caster versions of the Cleric and even Druid appeared eventually. So, IMO, Sorcerer isn't just an "alt-Wizard", but something else.