While Hamilton's McLaren team were desperately off the pace during winter testing, BMW Sauber consistently kept up with Ferrari, Toyota and Renault and surprise pace-setters Brawn GP in their final test in Barcelona.
And encouragingly, in his last test run in the F1.09, Kubica rattled through a race distance with no reliability problems.
But it is not all plain sailing - the introduction of the optional kinetic energy recovery system (Kers) could derail Kubica's progress.
The system delivers drivers a boost of 80bhp for seven seconds per lap at the push of a button, but it weighs about 35kg - and for tall drivers like Kubica that is a huge disadvantage.
The extra weight takes up virtually all the leeway teams have to play with with ballast to fine-tune the performance of their car.
And the heavier the driver is, the worse this problem gets.
Theissen and Kubica had an up and down relationship in 2008
Kubica lost seven kilos ahead of the 2008 season but had to be persuaded to eat more by those close to him after coming dangerously close to passing out at the wheel.
This winter he has shed three kilos - more weight loss is simply not an option.
But if there are doubts about how he will be affected by such intricate technicalities, there are very few about his natural ability.
Hamilton, a rival since as far back as their karting days as teenagers, has previously named the Pole as the driver he most feared.
Kubica has a metronome-like consistency. In 2008, he claimed points in all but four races - a feat matched only by champion Hamilton.
His intelligent understanding and ability to guide the team has also impressed BMW Sauber's technical coordinator Willy Rampf.
"The feedback we get from Robert is very precise and reliable," Rampf told BBC Sport.
"He can feel all the small changes we make to the car and that is important in helping us push in the right direction."
I did not have an easy start to life as a driver because I came from a country where there wasn't a culture of motorsport
Robert Kubica on growing up in Poland
Kubica has been pushing himself full throttle towards F1 virtually all his life.
Raised in a small flat in Krakow, his father Artur gave in to his four-year-old son and bought him a little off-road car.
His parents borrowed money from the bank to fund Kubica's racing and, after winning six Polish karting titles, he went to live alone in Italy to compete in the Italian championship before moving to single-seaters.
"I learned to grow up a lot more quickly," says Kubica, who left school at 14.
"I did not have an easy start to life as a driver because I came from a country where there wasn't a culture of motorsport. It was difficult to find support - but I was lucky."
In spite of his "rags-to-riches" journey to F1, Kubica remains grounded, deliberately shying away from the media circus that accompanies the world's most glamorous sport.
"I don't fit perfectly into this F1 world," says Kubica, who prefers to spend his free time watching rallying, or playing poker, snooker or a frame 10-pin bowling.
"Many people are in F1 not for the same reason I am here. What I like about F1 has four wheels and a steering wheel."
Kubica is not looking for the distractions of pop-star girlfriends or parties to shift his focus from his quarry - the win.
"Most of the drivers are happy just to be in F1," comments Morelli. "But they are not winners.
"Robert is a winner. He isn't there to participate, he has one goal in life and that is to be first."
If BMW Sauber have got their sums right, by the end of this season he might just find he is.
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