It's not odd. They'd agreed to terms, but that doesn't force anyone to sign. Reading between the lines of Jose Cortez' article linked to below, however, I wonder if Perez waited too late and only signed after Dennis had stepped in and said to cut him loose.
I think Jo Ramirez' comments are worth reading. After all, he's been behind Perez for years, introduced him to McLaren and pushed them to hire him. He's pretty harsh on Checo...
"McLaren needed a better driver than Jenson Button, they didn't need an equal, but Checo wasn't up to the challenge, except on a few occasions," explained Ramírez. "Leaving aside his driver skills, there are other aspects to being a Formula 1 driver. Sergio is an intelligent person and he will know why he lost his seat with McLaren.
"Sergio will probably be uncomfortable reading this, because sometimes the truth is not nice. He had a golden opportunity, one that only comes once in a lifetime. His problem was never integrating with the team. The syndrome of becoming an F1 driver went to his head very fast. He always complained about the British press, but they were the same press that wrote: ''Checo', a good driver, but why is he so arrogant?'
"'Checo' grew a lot as a driver during the last three years in F1, but unfortunately he didn't grow as a person at the same rate. Today the drivers are arriving in F1 at a very young age without knowing how to behave. In most cases they have a manager that coaches them. Sergio tried to do it alone and failed."
"I'm certain that we will see him driving in F1 next year, but I doubt that he will drive for a big team again, and by saying this, I hope with all my soul that 'Checo' makes me eat my words," Ramírez went on to state. "But he will need to focus very much on his profession, wanting to do it with passion and without any pretension of money."
Of course, Ramirez is a McLaren man, but I think he's being honest here. After all, he foreshadowed this back in December...
“I think Sergio has done all the steps in the correct way, been very focused and he’s been good and very tough, but in the last two years he has developed himself much more as a driver than as a person.
“He’s still a child, very young. As a driver he’s full of confidence, when he talks with his engineers he really very much knows what he wants to do on the car and he doesn’t let himself be convinced otherwise.
“Where he has to learn a lot, especially going to a team like McLaren…he doesn’t much like the press, he doesn’t talk too much to the press. The minute he sees a press guy, he runs…so that he’s got to learn. In a team like McLaren he has to be good to the press.”
“You saw how Michael Schumacher applied himself, like Ayrton Senna did; like Fernando Alonso. They are there 10/10ths all the time. If you don’t do it, the next guy is going to do it. To be successful, you’ve got to do it.”
Livio Oriccio is equally harsh, but the translation is a bit difficult...
http://translate.google.com/translate?s ... mitment%2F
I think it's interesting that his sources at Sauber say that technically Perez is better than Hulkenberg.
And another critical article from Jose Cortes...
http://translate.google.com/translate?s ... e%3Dcolumn
If we're to believe that, then Checo was demanding a two year contract with a pay raise, while Whitmarsh essentially wanted him on probation. And then Dennis stepped in and put an end to it...
Makes one wonder how much more stepping in Dennis will do.