Huge controversy rules in Detroit about the health and prospects of the Chrysler-Fiat merger. They're based largely on reporters'  arying attitude to the facts that a) Chrysler failed to have a traditional conference, b) that it took the jaw-dropping step of associating Ferraris, Maseratis and Fiats with Jeep 4x4s and Ram pick-ups on the Chrysler stand, and c) most controversially of all, displayed a Lancia Delta with Chrysler badges and a new grille. I'm realise I'm in the distinct minority by thinking, on balance, that it'll all work out - mostly on the strength of the half hour I spent with Sergio Marchionne this morning, putting the most awkward questions I could think of, then listening to the casual eloquence, plausible optimism and winning logic of his replies.