Testing is testing. Racing and first championship points are still a long way to go. You can count on Lorenzo to be there, when racing starts.
But on the other hand, if Rossi goes really well in testing, he should be experienced enough to convert it into a good racing performance, I think. Marquez goes well, but he´s still a rookie in the class, so may have a few problems to do the same.
Also remember the kind of season Lorenzo had last year?? If he keeps that up, there´s absolutely no room for mistakes for anyone who even dreams to challenge him. Like him or not, but he´ll most likely be damn tough to beat for the title again. Being a fraction faster than him on one track, on a single lap, ok nice, but doesn´t really mean much.
But with those three (and Pedrosa, and a few others) I do think this year´s gonna be cracking!