Can't be 2003, since post-quali parc fermé rules were in place by then. I'd rather think he'd have switched to the t-car with Barichello's setup in such a case. That, however, was a very common was of handling things with all teams before parc fermé rules were put in place.
Other than that you're pretty much spot on about Alonso's abilities, anyone who seriously doubts them must have missed quite a bit since his entry. He is hard on his fronts (that was stated by a few experts, it was quoted on TV this weekend, forgot who said it, though), which is not so much of a factor though since Michelin provides Renault with other tires than say McLaren anyways and can consider this. But it is within reasonable use of tires and can only bite him in extraordinary conditions.
Right. First Engine failure in 6 years and maybe 2 or 3 other technical related retirements in that period. He must really destroy his cars. NOT.